IMac Intel :: Unable To Turn On System / Shut Itself Down And Refused To Power Back Up
Jun 19, 2008
I have a 20" intel-based dual core Mac which i have had for about since early 2006, i haven't had any big issues with it until a few days ago when it suddenly shut itself down and refused to power back up. I ran through the checklist that Apple Support provides, including resetting the SMC by unplugging everything and waiting 15 seconds or so but none of it worked. Eventually I just left the power cord unplugged overnight and in the morning I plugged it back in.
After having the power cord plugged in for a few hours and the machine turned off, i tried pressing the power button again and to my amazement it powered back on! Immediately i ran the TechTool Deluxe software that came with my extended protection plan (now expired) and everything was fine. Later that night however, I had left my computer on for a few hours before returning to it and realizing it had shut itself off again. Now I am back to where I started, going through the checklist provided by Apple and am really starting to get concerned. Does anyone know of anything else I can do, short of taking it in to an Apple store? Or is something needed to be replaced?
Information:
IMAC-Intel (Early 2006)
Mac OS X (10.4.11)
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Feb 15, 2009
I just bought my Intel-based iMac last night and it took forever to turn on out of the box. I guess I made a mistake by doing a "soft" power down last night, because this morning it will NOT turn on. I've tried using the power button and waiting. I've tried unplugging and plugging it back in, and then using the power button, and waiting. Nothing works. I've been a PC user for 20 years and just bought this, my first Mac, last night. I think I've made a huge mistake! How the heck do you turn these things on????
Information:
iMac Intel Based
Mac OS X (10.6.4)
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Jul 1, 2009
my iMac won't turn on. The day before yesterday happened the same thing, but after a few tries with the power button, it eventually turned on - and all ok yesterday. Both the day before yesterday and today, the general power was turned off for some minutes, but the iMac wasn't running. So now, I've tried to reset the SMC, removing everything attached, but nothing.
At least I can clearly hear the tic tic tic button, probably of the timer, because I set up a schedule to let it turn on at a certain hour. What can I do? It's a white iMac, never had a problem.
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Oct 31, 2007
Just recently (this night,) whenever I would unplug my main USB hub, my iMac (Late 2006) would turn off (that is, instantly shut down as if the power had been disconnected). I don't know why this happened, but it turned on immediately afterward so I shrugged it off. The last time this happened, (the 4th time,) the iMac wouldn't turn back on at all.
It responds to power button presses, and you can hear the harddrive spinning up and the CD drive whirring and fans spinning. The sleep light in front stays on, but the display stays black, and it doesn't make the characteristic chime when it "turns on". In addition, it doesn't seem to be delivering power to USB devices, so there's no way that I can boot up from a startup disc or anything to see what's going on.
What do you guys think could be wrong with my computer? I doubt my non-existant applecare would cover anything of this sort, and I'm pretty sure that i'm SOL for hopes of a computer that just works. In addition, one other question. I was working on a VERY important school assignment at the time, (cliche, I know,) so is there any way I can connect another computer to my iMac so I can get my school assignment off of it?
Information:
G5 Intel iMac (Late 2006)
Mac OS X (10.6.4)
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Jul 1, 2010
I tried the "search" box before making this thread. Would like to know if the power supply from a 2008 MacPro work on a 2006 MacPro. If anyone has tried this? My 2006 MacPro shut down suddenly and would not turn on. I use an APC UPS plugged on a power surge outlet. The Mac technician who examined the unit suspected it might be the power supply but Apple may not have in stock the power supply for the Ist Gen MacPro.
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Apr 17, 2012
I was using it like any other day and it just turned off. Now it wont turn back on even with switching outlets!
Info:
iMac, Mac OS X (10.5.8), iMac G5 w/iSight
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Jan 25, 2007
My parents recently bought an iMac. Yesterday my mom was playing a game when the computer froze. Neither force quit or holding the power button was doing anything so in her frustration she unplugged the system. Today, after plugging in the system again, it won't turn on.
I press the power button on the side of the wireless keyboard and the green light on the keyboard turns on for about 3 sec and then starts flashing. No fans start up and the screen does nothing.
Information:
iMac and Macbook Pro
Mac OS X (10.6.3)
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Apr 3, 2009
My girlfriend changed the user's name and the problems started (iMac wouldn't remeber system settings and denied access to some files and catalogs). When I wanted to fix the problem I probably made a mistake and changed the access settings of some files (finally even hard disk's settings). After this action my iMac doesn't start (the screen is white with the apple logo and nothing happens). Is there anybody who knows what to do now?
Information:
iMac
Mac OS X (10.6.3)
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Apr 4, 2012
My back light won't turn off when i shut the lid of my mac book pro is there a setting to change this?, My back light won't turn off when i shut the lid of my mac book pro is there a setting to change this?
Info:
MacBook Pro
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Jul 1, 2014
I was launching my sims game when I plugged in my portable charger in my MacBook Pro. As soon as I plugged it in, I heard a tiny poof and next thing I know the screen turned black. I held down the power button like I normally would and it wouldn't work. when I plug in the charger, there is a faint green light.
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Aug 25, 2014
I was loading some CDs into my iTunes library when the disk drive refused to "suck in" the next CD. How I might proceed?
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Jul 27, 2008
My iBook G4 is refusing to turn on. Yesterday it started going really slow and pressing the power button wasn't bringing up the usual options, so I held the power button to switch it off. On turning it back on it got stuck on the screen with the Apple logo and spinner for a long time so again I powered it off with the holding of the button. I then let it cool down (it was really hot) but now when I switch it on the spinner spins around 6 times then it turns itself off. It is still chiming. I'm away from home and don't have any discs - anything I can try or is it time for the Genius bar?
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Apr 19, 2009
I have a 17 Inch Intel-based IMac (2006). when I press the power button I can here and feel fans running but the Power Indicator Light turns on and the screen remains black. Nothing else happens. Not sure what I did. I didn't take anything apart. I checked over the whole compartment and all connectors appear to still be connected.
I did some research figured out how to disassemble the IMac, purchased a new hard drive, backed up the computer and when I took it all apart there was a third connector on the hard drive (temp sensor?). The new drive did not have this connector so instead of experimenting I put the computer all back together.
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Jan 7, 2011
tonight I started having trouble with my intel iMac (running OSX 10.4.11). I'm having issues with two things (bolded for those skimming):
Out of seemingly nowhere, my iSight light turned on and now wont turn off. The only program I had open at the time was Firefox. When I try to open up PhotoBooth it says this:
There's nothing listed under USB High-Speed Bus in the system profiler either.
I've tried logging out of my user account, restarting, shutting down, unplugging and holding the back button for 5 seconds ...none of that worked. I tried resetting my Mac's PRAM and NVRAM. That didn't work either, and that's where a second problem appeared: when I try to shut my computer off, it freezes. I have to shut it off by holding the back button.
Is repairing the permissions and/or disk worth a shot? Or should I just take it straight into the Apple store? I hope it's not a hardware issue because I just recently had a new hard-drive installed after it broke down on December 15.
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Dec 3, 2014
Trying to download and upgrade for wacom tablet and the system password is being refused for some reason.
Info:
iMac (27-inch Mid 2011), OS X Mavericks (10.9.5)
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Mar 21, 2009
i just got my new imac 2 days ago. I was wondering is there another to turn on the power without pressing the power from button? (cuz i remember u can power on from the keyboard b4)
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Feb 19, 2012
Older Power Mac G5 Dual Quad will not turn on. Just turned off while working. Good news everything backed up. Can anyone offer help to solve problem??
Info:
PowerMac
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Oct 30, 2009
i have my power saver set up so that the display goes to sleep after 30 minutes do i get it to wake back up without pressing the power button in the back?
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Mar 25, 2012
Is this an indication that some hardware item is needing replacing? After a shut-down I'm having to keep the power button depressed for probably up to a minute before the system comes to life.
Info:
iMac, Mac OS X (10.7.3)
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Jun 3, 2012
My iMac won't shutdown unless I hold down the power button. It just sits on the grey screen, sometimes with the cursor sometimes not.
Info:OS Lion, Mac OS X (10.7.2)
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Sep 10, 2010
Everytime I open iChat, it will not let me log in and it says "The host refused the connection" So some people have suggested that I change the port number to 443. Which then I can log in but I can't video chat. Does anyone know how to fix this?
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Aug 20, 2014
my Macbook Pro is not powering up, Yesterday I connected a camera that has the USB cable with the little transformer. And the Computer suddenly turn off! It´s not working at all... I really don´t know what happened..These are some of the characteristics of the problem:
1) Not even the battery Light its on when I press the Power button.
2) Not even the Light in front of the Mac is on when I press the Power button.
3) There is not even a sound of the cooler fan or anything.
4) When I connect a the power cable the first 10 seconds the light of the cable is off... Then it appears a little "Orange intermittent" light but nothing more happens.
Info:
MacBook Pro, iOS 7.1
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Jan 19, 2008
I have my Gmail account set up for IMAP, and use it in Mail. However, as of this morning, Mail can't connect to either the IMAP server or the SMTP server. Whenever I try to connect to the IMAP server, it gives me the following error:
"The server '[URL]' refused to allow a connection on port 993."
I've checked repeatedly and all of my settings are as the Gmail website says they should be. Does anybody have any idea how to fix this?
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Jun 14, 2012
While I was creating a multiple .rar file I accidentally shut down the power, after restarting the imac it won't respond and the only thing I can do is move the mouse cursor, but nothing reacts.
Info:
iMac
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Feb 16, 2012
I just purchased my imac last week. I am trying to shut down my computer so I can go to sleep. Everytime I try to shut it down a window pops up and it reads "can not shut down programs are still operating go to finder."
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Mar 8, 2007
I just aquired a PowerBook G4 (500Mhz) and it is dead. It will not turn on no matter what I try and when I plug in the power adaptor it glows a bright orange (almost red)...what does that mean?
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Dec 7, 2014
iMac 27 locking up after sleep mode requiring full power shut down and rebooting in safe mode then shutting down and rebooting normally.. Permissions and this check show no errors, the only error sleep mode failure. Boot up is very slow as well as wake up when possible is slow. Yosemite seems to need a new release in order to correct the boot problems. System operates more like a Windows machine than Apple machine what's going on?
Info:
iMac, OS X Yosemite (10.10.1)
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Apr 13, 2012
Using my iMac today working away and all of a sudden the screen went black, there was no power to the computer at all. I have checked the fuse and that is ok. I am getting power to everything else. I reset the SMC as per Apple instructions on their website. Again nothing.
I then left it turned off for a good 5 mins and then turned on the power. The fans turned on and the mac then chimed, the creen came on and I thought everything was ok. Then the computer turned off, fans and hard drive sped It didnt even start booting to the Apple logo or the log on screen.
I am thinking this is a power issue within the computer and this will need to be replaced. I was wondering if anyone else has had this problem. My iMac is a 2008 21inch iMac. It is connected to a APC UPS which again all power ports are working, as I have tested that with a desk lamp. What I do normally is turn the UPS when I have shutdown my Mac in the evening and then power it up next day. While the UPS is doing is power self test I then boot the Mac, I am wondering if I should just leave the UPS turned on all the time and just unplug my iMac when I am not using it. Sometimes I do pop it to sleep last thing at night, but recently I just turn it off.
It has had heavy use so I am wondering if it is indeed curtains and I need to buy a new iMac. Maybe it is an excuse to buy a 27inch one! (Would be nice)
Info:
iMac, Mac OS X (10.7.2)
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Apr 18, 2012
For some reason when i turned my imac on tonight my bluetooth is turned off and my wireless mouse is not recognized so i can't use it to turn my bluetooth back on. Not what do I do?
Info:
iMac, Mac OS X (10.7.3)
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Aug 6, 2010
I left my iMac on overnight last night to finish downloading some stuff. I woke up and all our clocks are flashing, so we must've had a blackout. Anyway, I went to check the progress of my downloads, and the iMac was off. I pushed the power button and nothing happened. No fan noise, HDD noise, nothing. I've been trying for almost two hours now and nothing is working.
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