OS X Mavericks :: Receive Prohibitory Sign On Start Up And Cannot Boot Up In Safe Mode
Jun 25, 2014
I've been trying to partition my drives and install Windows on my late 2012 imac. I last adjusted my partitions using disk utility and now receive the prohibitory sign on start-up and cannot boot up in safe mode; pram reset; type commands in single user mode. Running on Mavericks OS.
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Jun 5, 2014
have a early 2011 MBP running OSX Mavericks. I use my mac everyday both at home and school. This morning when I opened the mac, the screen was frozen. I simply restarted the mac, and it doesn't go beyond showing a prohibitory sign. I have tried many things..Â
1. Restarted the mac, while holding the Option key (selected Recovery HD), after waiting for nearly 10 mins, the system loaded into recovery disk ( but the twist was, in the disk utility, my SSD was not found/shown)Â
2. Then thought the SSD was dead.. So asked the IT guy to see if he can retrieve the data (removed SSD out of the mac and he used an external hard drive enclosure and the SSD was instantly recognized, saved the data). Here I did two things
   A. First, asked my friend if I could mount his SSD in my Mac and see if the system starts. Even using a different SSD, my mac still showed the prohibitory sign.
   B. Then l installed my SSD into his Mac.. System booted as normal (basically it was all there, but on his Mac)Â
3. So ruled out that my SSD was faulty. Then using the internet based Apple Hardware Test (AHT), I found no troubles with any of the mac components.Â
At this point, I don't understand what is causing my Mac not to go beyond the prohibitory sign? Could it be something as silly as the internal hard drive cable or something more complicated as the logic board? In which case, they should have been detected during the AHT?Â
Info:
MacBook Pro (13-inch Early 2011), OS X Mavericks (10.9.3)
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Feb 15, 2010
I have a black MacBook that I got about 2 years ago, running OS X 10.5. I had about 10 GB free space. It's been working fine until this unfortunate event. Let me explain.
I was recently working with my mac as usual (browsing the web, downloading torrents, reading an ebook, ect). I tried to load [URL] in firefox, when it froze. Nothing new, so I tried to open up force quit. Nothing I clicked on responded. It was frozen. I also heard some weird "tinking" noises from inside the machine that I had never heard before. So, I inferred I should force shut down. I held down the power button, and it turned off. I hit it again to turn it back on. I saw a grey screen and an apple and heard the"dinggggg" noise we've all come to love like usual. But, suddenly the apple changes to a circle with a line through it, which I've dubbed a stop sign. It just stays like this. I can turn it off, and try again and the same thing happens. I've tried it like 10 times. (I know, the definition of insanity is doing the same thing over and over but expecting different results.
This is getting my adrenaline pumping, and I can't figure out what to do. Should I reset the NVRAM and PRAM like Apple says? I'm at a loss. Right now I'm using my friend's computer (running Vista ugh) to type this.
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Jun 2, 2014
I have a mac book pro 17. I have 2 logins. on the main one it takes a long time and only the top bar appears. the normal icons dont appear. when i move the mouse i just get the spinning wheel and i stays like that. you can not operate anything. you have to hold power button to turn it off.Â
- if i try to log in in safe mode it does not owrk either.Â
- if i sign in as another user in safe boot, things seem to work. i suspect something is not sitting right in the main sign in.Â
I have checked the disc and it says it is fine. Â I have tried to back up but i does not seem to work, it just seems to hang too.Â
Info:
MacBook Pro, OS X Mavericks (10.9.3)
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Jun 5, 2014
My Mac Pro main boot drive us encrypted. I booted into recovery mode the other day & it wouldn't let me boot back o my main drive. Now upon start up I can't enter either recovery mode nor safe mode nor chose the main drive to boot from. I'm absolutely stymied in what to do.
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Jun 30, 2014
Macbokpro 2.2ghz i7 - 4g ram...10.9.3
All of a sudden our MBP will only boot in safe mode. After reading about this there was some answers about the shift key being stuck which makes sense since i couldnt login to my user because its a 5 lowercase PW. i got a usb keyboard and with the shift key pressed down i can now enter my lowercase PW. I took both shift keys off and cleaned under them, there was barely any dust even. Still stuck in shift somehow. i tried to reset the PRAM by booting with Option-Command-P-R with both the MBP keyboard and the USB keyboard with no success. it only brings me to OS X Utilities where i can restore from time machine, Reinstall,
When i upgraded to Mavericks i did make a USB installer of it. I cant remember if 10.9.3 is the version i downloaded. When i check the USB i know i made it on Feb 12 2014, the day i downloaded it, and its version 1.3.40.
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Aug 25, 2014
I have a macbook pro 15-inch, Early 2011 running osx 10.9.4. I have a SSD hard drive that i installed myself a year ago and hasn't shown any defects. Its a 120 gb OCZ-AGILITY3.Â
My macbook will only boot in safe mode nowadays. I have done a complete erasion of my hard drive and installed osx mavericks twice already. After the installation the computer will safely go to the desktop. But if i then do a reboot it won't get further than after the first apple logo, sometime the turning wheel will pop up, before turning off and trying again. i have tried resetting PRAM, I have tried resetting SMC, i have tried avoiding SMC (with big fan rate), but all with no success.Â
I have done a complete hardware test (the longer one) and it showed "no troubles found".Â
My guess is that the problem is with the battery. My computer won't run anymore without the adapter, when i pull the adapter out it either stays on for a while before just turning off. Without having it plugged in it won't start. Is it possible that during normal start up there is some kind of communication with the battery that can cause this?Â
I ran a diagnostic shown in this thread (Will only boot in safe mode) and included it in this post.
Start time: 17:07:42 08/25/14Â Â
Model Identifier: MacBookPro8,2
System Version: OS X 10.9.4 (13E28)
Kernel Version: Darwin 13.3.0
Boot Mode: Safe
[Code] ....
Info:
MacBook Pro, OS X Mavericks (10.9.4), 15"
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Sep 9, 2014
My 2014 21" iMac powers itself down after about 10 seconds while trying to startup in safe boot mode. I'm not even sure why it is trying to start in safe boot mode. I shut it down after a power outage while plugged into an APS UPS. I'm guessing that since I interrupted the auto shutdown it is restarting in safe boot mode. Either way, I get a grey screen with a big apple and a progress bar. The progress bar gets to about a tenth full and the power just shuts off.Â
I've tried starting up while holding the alt key to select the Macintosh HD. The same thing happens.
Info:
iMac, OS X Mavericks (10.9.4)
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Nov 15, 2009
after about a week of using Snow Leopard, whenever I restart my mac, it starts up with a prohibitory sign, or a circle and a line through it. So then I have to reinstall Snow Leopard, and whenever I restart it after that, it always does it. But it won't do it if I restart it after a software update, specifically OS updates. This didn't fix it when 10.6.2 came out, and it's very frustrating. Anyone know what's wrong?
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Apr 13, 2012
Been having probs w Mac Pro w Lion seeming to hang on shutdown/restart. Have 'reopen windows' unchecked in prefs.  Was able to run through safe mode boot once but now seems to hang about 20% in everytime.  Have had to do shutdowns w power button (I hate that) or /by ctrl-option-command-esc Boot single user run rack -fy says 'apparently ok'Mount -uw / reports removed 10 orphaned or unlinked files and 10 directories?
Info:
Mac Pro, 2xDual2.66, 4GB, GeForce 7300 GT, 23" Apple LCD, Mac OS X (10.5), G4 Cube, Rev A/C iMac, NeXTCube,PwrMac8500,Quadras,SE30s,MacPlus
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Sep 3, 2014
My iMac24" can't booting in normal mode, but booing in safe mode only.
how to boot up in normal mode. If I restart the system, it is showing the apple logo and not going to Finder.
Info:
iMac, maverics
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Apr 6, 2012
I have been unable to restart me computer after a software update (White screen/apple logo/spinning wheel continuously). I have tried to start up in safe mode (holding down shift key) but it hasn't worked.
Info:
MacBook, Mac OS X (10.4.6)
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Jun 11, 2012
I have a MacBook 4,1 with Intel Core 2 Duo processor 4GB Ram. It is taking over 10 minutes to boot up past the gray apple screen when I turn it on. First I cleared the PRam (?) then I checked the disk using Disk Utility Verify, and it said the disk needed repairs. So I ran the disk repair and it said it was unable to fix the errors on the HD. Â
I did a little research and tried booting into the Single User mode, then running /sbin/fsck -fy. It said that it found errors but could not fix them. I ran it two more times as suggested and got the same result each time. I then tried rebooting and now instead of taking 10 minutes to boot up, it takes about 5 minutes on the gray apple screen and then just turns off. I started in Verbose mode to try to troubleshoot the error and it appears the last thing to come across the screen before power down is a message "Apple Yukon 2: RxRingSize <= 1024....etc".Â
I decided next I would run the Apple Hardware Tester. The test came back with an error code "4SNS/1/40000001:IG0C-0.265". I am very good at searching the web but I could not find any errors that had the IG0C or IGOC or any combination at the end, but plenty of 4SNS/1/40000000(1) errors with different endings. From what I can tell people are saying anything with 4SNS/1/4000000 is a logic board failure, but this computer was literally just booting this morning until I did the /sbin/fsck -fy.Â
Info:
MacBook, Mac OS X (10.5.6)
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Feb 12, 2008
Leopoard 10.5.2 - Quad Core Mac Pro.
I'm trying to start up in safe mode, per a recommendation from Objective Development, for a Little Snitch upgrade. I'm following these steps perfectly, and I see no indication that I'm running in safe mode. Of course, I've never seen safe mode, so I'm not sure what it looks like, but I'm guessing I ain't in it because I never see the "Safe boot at the login window".
Quote:
To start up into Safe Mode, do this:
1. Be sure the computer is shut down.
2. Press the power button.
3. Immediately after you hear the startup tone, press and hold the Shift key (the Shift key should be held as soon as possible after the startup tone but not before).
4. Release the Shift key when you see the gray Apple and the spinning gear. Please be patient, booting in Safe Mode may take some while.
During the startup you will see "Safe Boot" on the login window, which appears even if you normally log in automatically.
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Apr 3, 2012
Did a Shift - Command-V and the black screen showing all the startup steps appeared and it all looked good except: AFL Alart Sockwed cant update and INIT Reboot transmit failed. All else looks good. I have tried this 3 times and never go past that point. Then the screen turns off white like it does when it starts normally before the apple appears and the last time the screen went black.
I have tried starting with just the Shift Key and computer starts up but not in safe mode. I have tired starting with the OS X disk and the C key and it will not recognize the disk.I used the #1 disk since the instructions are printed on the disk. Did not work so I tried disk 2 and I get a menu to start the OS or tools. If I click on either one the screen goes white and stays that way.
computer starts fine and provides a login window, and then the desktop screen with screen saver pictures in perfect color. As it goes through starting programs it starts the same programs that is had open when the computer originally crashed. Even when I close them, before it locks up again, and I am forced to restart the same programs open up to the same place. Its like the computer is frozen in one location and will not go beyond that point. Eventually the screen turns white and sometimes black and sometimes gray.
Tech support thought it was the video card, put a new one in but did not fix the problem and then said it was not that but that it was the monitor. I said that did not make sense since the monitor and desktop icons and pictures are beautiful and clear. They then said it was the inverter board on the monitor and Apple only replace the whole thing. I purchased an inverter board and replace it. No change. The tech person said that the computer works find without the monitor connected - I will see if that is correct next. Isn't that a more systimatic testing procedure then trying parts to see if it works? Oh I did do the complete long hardware test. Took about an hour and it passed! Isn't this strange?
Info:iMac, Mac OS X (10.5.8)
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Apr 20, 2012
my Imac takes 5 minutes to start , most of the time it is a blue screen....
Info:
iMac, Mac OS X (10.6.4)
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May 12, 2012
My 2011 17" MBP won't with OS X Lion won't start up in safe mode...
Info:MacBookPro, Mac OS X (10.7.4), 2011 17" MBP with 8 Gigs of Ram
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Dec 10, 2014
I'm selling my old iMac and while cleaning the hard drive it froze. I forced shut down and when I turned it back on a circle with a diagonal came up initially, followed by flashes of that, a question mark and the apple symbol. Now it won't get past the grey screen and the flashing symbols. Â
Info:
iMac, Mac OS X (10.4.11)
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Sep 21, 2008
I woke up this morning and my iMac G5 (w/ Leopard) was frozen. I restarted it manually, but it would freeze on a blue screen without loading the OS. It can start up fine in safe mode, but that's it! I've tried repairing permissions and zapping the PRAM - any other ideas?
What can I do in Safe Mode that might fix my comp? I haven't recently installed any applications, and I have all "open at login" items turned off.
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Jan 18, 2009
I turn the machine on and the apple icon comes up and the thinking gear comes up but It won't go anywhere else I can't even get into safe mode.
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May 15, 2012
I've tried the safe boot but seems it is not working. I do need to recover my files.
Info:
MacBook Pro, Mac OS X (10.6.8)
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May 17, 2010
I have a 08 MacBook pro (not unibody) and it is now not booting up. I recently installed a Hitachi 500gb hard drive on the computer and restored through time machine and it worked fine for about 2 weeks and now wont boot and I'm wondering if its probably the hard drive. When I click power the light on the front of the computer will come on and it will sound like it is about to boot then a clicking noise seems to come from the computer and it instantly shuts off. I have gotten it to turn on a couple times since it happened by slamming the comp on the bed then for some reason it will work but as soon as I shut it, it wont turnback on. Any ideas?
Oh and PS the screen never comes on and can't boot in safe mode.
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Apr 22, 2012
I have a Imac PPC with a 2Ghz processor and 1GB of Ram. I am running leopard 10.5.8. Recently i woke the PC from sleep mode to find a blue screen with only the cursor working. Using the internet, I determined how to get the PC booted in safe mode. I have used all the disk utilities at my disposal along with onyx and cocktail to try and fix what I believe is a startup problem. I hae booted the PC in single user mode and tried the fskc codes, which i believe is just the same as the disk utility. Based on my computer all permissions are correct and there is nothing wrong with the HD. The PC still will not boot normally. I have even done an archive and re-install of Leopard.Â
Info:
iMac, Mac OS X (10.5.8)
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Dec 8, 2008
My iMac G5 froze. I restarted it manually, but it kept freezing on a blue screen without loading the OS. It can start up fine in safe mode, but that's it! I've tried repairing permissions and zapping the PRAM.
Finally I resorted to an Archive & Install. That didn't work so I did a clean install but that didn't help either. After having done everything under the sun to it to get it to work, it will still only start up in safe mode. I even tried starting up off each of my two external fire wire drives with no luck (it froze on the fire wire screen with both drives - a Maxtor and a Western Digital). I am thinking that something on the mother board has died so that normal booting is prevented but safe mode booting is allowed.
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May 7, 2012
My macbook (early 2008 model). Looks like my disk drive isn't working correctly; I put in a new hard drive. I went to reinstall Snow Leopard then upgrade to Lion. Ever since then my mac only seems to work in safe mode. I used my imac to load snow leopard (with firewire); and downloaded lion from app store. Is there a way to wipe clean and start over? There is nothing on the computer that I need. I keep all my important files on an external hard drive. My big concern is I don't know how to do it and second since I don't have a disk for lion will just going back to app store allow me to re-download or will I have to pay 30 bucks again.
Info:
MacBook (13-inch Early 2008), Mac OS X (10.7.3)
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May 20, 2012
As of yesterday my Mac book pro will not start up. It will not go past the gray screen with the apple and spinning timer indicator. When I try and start up holding shift to enter safe mode it will not start up either. I have tried turning It on and off many times. I am not sure what to do or what the problem might be. Running OS 10.7.
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Jun 6, 2012
How do I boot in a safe mode my iMac? I hold down the shift key after the whistle when turns on but it take me to the normal screen.
Info:
iMac, iOS 5.1.1
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Jul 5, 2012
MY MBP is giving me the "NOT" sign on start-up. This comes after initially displaying the Apple logo. This MBP had a new logic board installed by Apple just two weeks ago -- and I know I can take it back but I'd like to fix this myself. I put in a different hard drive after getting the MBP back. It has worked fine for several days. Don't know if these points are relevant, but:
1. First thing I noticed today is that neither of the USB ports would read a flash drive. The port would, however, work mouse and keyboard.
2. The initial non-boot episode took place when I had external hard drives daisy-chained in via Firewire. But, again, this had worked previously, as recent as this morning.This may be significant:
3. The last tasks performed on the MBP were -- for the first time -- to edit video in FCE, make DVD in iDVD, burn IMG file.
4.I have connect this MBP as a target FW drive to another MBP and run "disk verify" and "disk repair" in Disk Utility. It says the drive and permissions are okay.
5. I have booted to a copy of Disk Warrior (latest version, version 4, I believe) and rebuilt directories and files along with verify/repair permissions (everything DW will do). And when re-starting, it still won't boot.
6. When I boot off Snow Leopard DVD and run Disk Utility¦"verify disk" says "the volume appears to be ok¦.when I "repair disk" it reports "Volume repair complete." and "Updating boot partitions for the volume as required."
7. I'm able to boot in SAFE MODE, but when I try to restart in normal mode, it won't boot (so nothing was automatically fixed)What can I do in safe mode to address my problem?
Info:
MacBook
Pro, Mac OS X (10.6.8), A1260 2.4GH 2GB Ram 750GB HD FCE4
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Jun 29, 2014
OS X 10.9.3 2.53 Ghz Intel core duo 4 GB 1067 MHz DDR3
MacBook Pro 15" mid 2009
Issue-will ONLY boot in safe mode
Background-previous keyboard issues caused by spillage. 3rd party keyboard in use
Action taken - recent 3rd party apps deleted: First aid disk utility checks okay (perms & disk)3rd party keyboard was working fine until 2 days ago.
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Mar 8, 2012
I'm getting the gray screen when I startup. I tried using the install disc to repair the utility, but it said it cannot be repaired. I had to use a plug-in mouse instead of my normal wireless mouse to get the startup disc out on a restart. I want to now startup in safe mode, but holding down shift during startup with my wireless keyboard doesn't work. Do I need to have a plug-in type keyboard for this function to work? Can you backup files using safemode?
Info:
iMac, Mac OS X (10.6.3)
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