Power Mac G5 :: Upon Start - Display Flashes Colors - Cuts Out / Goes Black
Dec 4, 2007
I have a 30-inch cinema display and a Power Mac G5 (quad). Last night I was toying around by trying to boot an old 450 MHz G4 connected to my G5 via firewire ( I need to do some work on the G4 and it doesn't support my big display). So I connected it to my G5 via firewire target disk mode, then selected the disc (which has 10.2 on it) in the Startup disk preferences via System Prefs. Then I tried it and got a kernel panic. Alright, so it didn't work. Oh well. But now that everything is disconnected and my G5 is back to it's normal state (meaning the G4 isn't connected at all), when I start up, my display acts very weird. I get a few flashing colors blocks at the beginning, then it blacks out. Then when I login, it goes black again, then pops back on. So I'm trying to figure out what I did to my baby and how to fix it.
Information:
Quad-core 2.5 G5
Mac OS X (10.5.1)
30" Apple Cinema Display
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Aug 17, 2010
So I bought my MBP this past May and didn't have problems with it until now. I recently opened up my photo booth and noticed that the display flashes very quickly into different lightings/colors. It's very strange because the ceiling fan isn't on, and my MBP is sitting still. I've never seen this issue on anyone else's MBP either. I'm leaving for college very soon and don't want to leave unhappy with my MBP. If I visit the genius bar, will they give me a replacement with my one-year warranty?
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Dec 13, 2007
When I start my computer up in the morning everything else starts normally. First the light comes on on the front of the computer and on the bottom of the monitor, then the start up tone rings and the computer is fully running. But my monitor is black and I do not get the apple picture or nothing on the screen. I thought my monitor was going out, but we have another work station the same and I switched the monitors (same 27" cinema screen as mine). I can actually use the other computer and network into my computer and fully use everything on my computer. But my monitor is black (no display)! I have contacted MAC and have reset the PMU button many times and sometimes this works, but most of the time it does not. I just keep restarting the computer and finally it will start up normally with the display and everything.
Information:
Dual 2ghz PowerPc g5
Mac OS X (10.4.11)
27" Cinema Screen
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Sep 4, 2014
My external display (HP w2207) seems to conflict with my MacBook Pro (15 inch Retina display, early 2013) since I upgraded MacBook OS to 10.9.4.The external display works at initial boot of Mac but does not work after OS sleeps and I attempt to awaken, and while the external display is not waking, the Retina display flashes through different screen views, which only partially reflect my normal screen, or do not reflect my normal screen at all.Â
Info:
OS X Mavericks (10.9.4)
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Feb 18, 2010
I am trying to repair a macbook pro for a friend, I think it's the logic board, but I wanted to check with you all before I go buy one. When the battery is fully charged, I press the power button, I hear the hard drive spin for about 5 seconds then stop. The superdrive on it is broken so I can't try the restore disk. I ordered Pram, I am going to replace that. I tried two different hard drives and I know they are both good, I tried them in the macbook and through a usb port, and the same thing happened both times.
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Mar 2, 2008
It happened twice in a row about a week ago (and then stopped, so I figured I'd let it go), but it just happened again right now, so I'm figuring there's got to be something else going on. My only guess would be the battery... but I just had that replaced a few months ago, so it seems kind of odd to be having problems already. If it is the battery, how severe of a problem would this be? Is there something I could do to fix it, or can I just live with it until the end of the school year... or do I need to have this fixed ASAP? (And on the off chance that this is a related problem, my speakers have been making that funny crackling/static sound when I wake the computer up from sleep... I was reading some threads about that around here, but to the best of my knowledge the problem was never really resolved.)
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Sep 16, 2008
My iBook G4 occasionally cuts out without warning when it's being powered by the battery.The battery still seems to have charge - it will light up all 4 charge lights when the button on the battery itself is pressed.It also boots back up straight away when the power on button is pressed after having cut out.This has never happened when the iBook is plugged in to the mains supply.
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May 27, 2012
the display's started cutting off unexpectedly. It started a few months ago with random restarts, which I thought were caused by a bad hard drive, but it turns out permissions errors, stacked up over the years, really can bork your computer. I replaced the hard drive (didn't mind opening her up, since she's well out of warranty), but the problem kept occuring - only with the screen going dark randomly. I thought the new hard drive was dying, too. But here's how it's been going down lately. About twice a day, the screen will go black. Not just the backlight; it's as though the display has been turned off. I can't wake it from the display sleep, but it's not for lack of hitting the space bar repeatedly. Keyboard backlight stays on for a second, and then goes dark, at which point, I'll force a shutdown and try to restart. All of which is messing with my data; I've been doing a permissions repair pretty much daily now, and there's loads of 'em to repair. I noticed today, when it happened earlier, that my hard drive is still spinning, and USB peripherals retain their power. So what is causing my display to cut out like this, and how do I keep it from happening again (at least this frequently) until I can afford a new MacBook?Â
Info:
MacBook Pro, Mac OS X (10.6.8), 2006 MBP
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Dec 28, 2010
I've connected my Macbook to my Samsung TV via HDMI and it works great!
I've been using the TV for it's speakers and screensaver so I'd like to be able to put on iTunes and have my slideshow play on the TV while I have guests over.
It works great, but if I don't touch the macbook for 20 minutes, the signal to the TV cuts out. The Macbook isn't going to sleep, because I've adjusted those settings accordingly. I feel like the TV is stopping the connection for some reason. As soon as I touch my macbook, it resumes playing and everything.
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Nov 19, 2009
Im not sure why but when i first turn on my macbook a very fast pop up comes on and goes away. It has been happening ever since i turned my firewall on last week after realizing it was somehow off.
i have tried to take a picture and video to read the pop up but it fashes so fast i can read it. it looks like a allow/deny request. I was not able to find out what it was online.
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Mar 15, 2012
After leaving machine on all night as I usuaaly do in the middle of a project I came in this morning to find power button blinking no -stop. No images on displays.Have reseated RAM (original 2G from Apple and subsequent modules (4x2) from OWC) twice and no change. No peripherals connected and no change.
Info:Mac OS X (10.6.8), Mac Pro 3.0/8-Core, 18G RAM, 2-1Tb
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Feb 19, 2008
A weird thing has started happening to my Mac Pro today. After using it for a few minutes the cinema display it is attached to on the Mac Pro just goes black. The Mac Pro is clearly still on - the light is on and i can hear the fans. The Mac Pro shows up on my local network and i can connect to it and access files from my Macbook, but screen sharing doesn't work (i just get the message 'contacting mac pro' and nothing else) and i can't connect to shared iTunes library either, which makes me think it is not just a display issue. I cannot wake the computer with the mouse or keyboard, which makes me think it isn't just a sleep issue. All i can do is physically turn the Mac Pro off, start it up and it will start up successfully and then work for a few more minutes before i get the same problem. I have reset the PRAM and SMC and still have the same problems. Can anyone suggest anything else i can try?
I should mention that i have another problem with the Mac Pro in that it has been spontaneously waking up from sleep and starting up from shutdown, and i still haven't resolved this. I don't know if it is connected to the above issue.
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Jun 17, 2014
When I start my Mac it goes to white screen with flashing apple and stop sign. It will not any further.
Info:
MacBook Pro (13-inch Early 2011), iOS 7.1.1
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May 26, 2012
My screen looks black and colors are crazy. How do I fix this?
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Jun 26, 2012
My Macbook Pro does not always turn on first time, it takes awhile to click on, it just clicks every time I try to turn it on, It turns on when its warm though, it also turns off when I close the lid, but the light says it is on, after leaving the lid closed for more then 5 minutes, and I open the lid it is turned off? I do not understand what is cuasing the problem?
Info:
MacBook Pro
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Aug 29, 2014
Mac Book Screen only Displays in Black & White, Need to change to Color But don't know how to.
Info:
MacBook, Mac OS X (10.6.8)
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Jun 1, 2014
My screen will flash pink with a yellow apple icon just after the spinning gears has stopped when I start up.
Info:
iMac, OS X Mavericks (10.9.3)
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Jun 12, 2010
I use my MBP connected to a Dell U2410 and everything has been ok for the last 5 months or so (I got the MBP around the beginning of Feb.). However recently, my display will start flickering (blinking) a blue screen up to the point that it is completely unusable. Often if I simply unplug the mini displayport from the mbp and plug it back in again, everything goes back to normal for awhile. Just now I was able, between flickers, to switch from the integrated graphics card to the dedicated (?) graphics card. Although I did get a few flickers logging back in, so far it's been ok.
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Mar 3, 2012
I have an HP keyboard and somehow I must have hit the wrong key combo
Info:
Mac mini
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May 9, 2012
My screen has lines going across the bottom and some on the left side of the screen as well. what caused this and is it fixable.
Info:
MacBook, Mac OS X (10.5.8)
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Jun 28, 2009
I have the 9C9E display. Is this a good one? Also, the colors on MacRumors look purple, where on my moms 2.4 Macbook they looked blue. Especially the thread links. What do I do?
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Nov 14, 2009
I've just installed the 10.6.2 update in my new 21.5" iMac. When my computer restarted all the colors look inverted in all applications, dock, menus, photos, desktop image, everything. Does anyone has the same problem or an idea of how can I fix this?
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Aug 12, 2010
I have a copy of Sim City classic, I tried installing on my MBP, no classic/can't lower the screen resolution low enough. I picked up a Power Mac 5500/225 from work, figuring it would do the trick. I can't get the graphics any lower then 256, the game wants 16! It also has a black and white game, but even after I turned the monitor to black and white, restarted, still didn't see it as two tone. I love the original version of the game, and even though I know people claim you can play on the Maxis site, they never send me a log in, no matter how many times I try
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Oct 22, 2010
I was given a Macbook 5.2 2009 Early, with nvidia 9400m because it has a little problem and the previous owner has taken another one. Basically, the display colors are fuzzy. I already tried the CTRL ALT CMD 8 but does not change much. I tried resetting the PRAM by holding down ALT + CMD + R + P at startup and waiting for the second sound before leaving, but nothing happened. I tried to re-install the operating system, but no way. I cannot try it on an external monitor, but using teamviewer this is the result, you see everything perfectly. The image also shows colors comparison. Could that be the display data cable? Display itself? VGA card?
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Dec 12, 2008
In display in system preferences there is a tab with "Millions," "Thousands," and "256" colors,but 256 colors is dimmed. How do you set your MAC display to use 256 colors so I can play an older game?
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Jun 24, 2014
Suddenly yesterday when I powered mi iMac I had some horizontal green bars on the startup screen then it powered normally. But it happened two times, now every time I power on my iMac the screen stay black, and i can use my computer, everything else is working normally (i still can use Alfred to turn off my computer).Â
I already tried resetting the Command+Option+P+R, it didn't work. Also the Safe mode.Â
I have a mid-2011 27' iMac. EMC 2429.
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Sep 4, 2009
Okay, so I installed Snow Leopard on my parent's Mac mini and it has a Hanns.g display connected to it. In 10.5 Leopard, the colors looked normal (still not as good as an Apple monitor, but colors were close enough). Anyway, like I said, I upgraded to Snow Leopard and now the monitor's color is all out of whack. I tried re-calibrating it and everything. The weird thing is, I got the Finder to look okay, but all of the blue icons in the Dock (iTunes, iChat, Safari, QuickTime etc) look PURPLE! Also, the menu bar selections are the same purple color instead of that light blue. The other weird thing is... looking at the Finder icon in the Dock looks half purple and half light blue, but when I hit cmd-tab, it looks half blue and half light blue. The cmd-tab icon of the Finder looks like I'd expect it to look, but all the colors are completely destroyed in the Dock. Another thing is... scroll bars seem to look like normal blue too. One more thing... when I tried doing the manual calibration, it shows you how bright to make the monitor with the little graphic. The graphic looked so washed out that I couldn't make the monitor dark enough (on the darkest setting) to get even close to the picture that the calibration tool wants me to see. Is Snow Leopard only compatible with Apple monitors? I installed Snow Leopard on my Mac Pro (Apple Cinema Display) and all the colors are consistent. The colors look the same regardless of 2.2 gamma or 1.8 gamma, so please don't bring that up. I want BLUE icons... not purple!
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Mar 1, 2010
I have recently bought a 13" Macbook Pro and wanted to hook up an external display (an oldish acer 19"). I have a Mini Displayport to DVI adapter hooked up to a DVI -VGA adapter which leads to the display. I haven't got it to work yet. I have followed advice about closing the lid and using usb mouse and keyboard with no luck. The only thing that happens is that the screen on the laptop flashes blue for about a second after plugging in the Mini DisplayPort adapter.
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May 24, 2012
I came back from work to wake up my iMac. It made the noise but the screen stayed black. I tried restarting by holding the power button- I can hear it start and the chime but still have a black screen. I tried resetting the pram, and unplugging the cord but I still get a black screen. I can hear the chime though; I'm not sure if that means anything. I just had the hard drive replaced in February so I hope it's not that. just wanted to clarify that when I restart, I get the chime but the screen stays black- I don't get to the grey screen. So I'm assuming right now that my display may be shot?
Info:
iMac (20-inch Mid 2007), Mac OS X (10.5.8)
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Oct 26, 2010
It's been a while since I've hooked up my MacBook (late 2008 aluminium) to my TV (Samsung LE40M87BD), to use the latter as an external display for watching a film. Tonight I did it once again, and to my dismay the TV was displaying only thousands of colors. Maybe even only 256, I don't know. It's not a changed setting in my TV, as I've looked through its menu and couldn't find any option that would force it to display the millions it's certainly capable of.
After seeing this weird issue, I opened System Preferences. I looked in the Displays preference pane, but since some years Apple allows no manual control over the color depth anymore. So no luck there. I tried restarting, but that changed nothing. It outputs a correct 1080p 50Hz (PAL) signal, but the colors are just all wrong.
How can it be that my MacBook always used to perfectly display millions of colors on my TV, but now suddenly doesn't? I'm using Apple's own Mini Display Port to DVI adapter, and then a DVI to HDMI cable, which always worked problem free. So it's not the cables, I think. It has to be something in the hardware or software. I'm hoping it's software, otherwise it will be a more serious problem. I haven't tried BootCamp yet, but will do so tonight, just to see if Vista will output millions of colors.
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