HT201177 IMac screen goes black and will not return without power cycle. Time of events 19 min to 43 seconds after desktop shows

Display goes black
19 min is longest it lasts goes down to 43 seconds after desktop appears
Just updated to Mt Lion same time this started
I am guessing video card went out at same time?
Do not have D test for hardware after upgrade.
20 inch 2.4 Core 2 duo 2gig. Ati radon hd 2600 256 mb graphics
Suggestions?

I did some more digging, it appears to be a backlight problem only. I can see the screen very dimly if I use a bright flashlight in a very dark room. It also seems to run ok if the brightness is turned down a LOT.
So I'm thinking this is a LED driver board issue or the display itself. I'll open it up and check the connection between the two and see if I can get any more clues. At least I can use it somewhat now by dimming the display significantly...

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I did some more digging, it appears to be a backlight problem only. I can see the screen very dimly if I use a bright flashlight in a very dark room. It also seems to run ok if the brightness is turned down a LOT.
So I'm thinking this is a LED driver board issue or the display itself. I'll open it up and check the connection between the two and see if I can get any more clues. At least I can use it somewhat now by dimming the display significantly...

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Howdy OatsaMae,
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Apple computers: Troubleshooting issues with video on internal or external displays
Reset the system
You can reset the Mac's parameter RAM and SMC.
Reset the resolution
Start by resetting the Mac's parameter RAM. If the display does not come up, was previously set to an unsupported resolution, and still results in no video:
Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
Choose Displays from the View menu to open the preferences pane.
Select any resolution and refresh rate that your display supports.
Restart your computer.
Thank you for using Apple Support Communities.
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PlayBook lags and then the screen goes black and does not respond

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To tell you gusy fast and clear, it boots up as normal, fast and smooth, apps open and close as usual. Then it starts to lag, and freezes for one second, responds and freezes again but this time will not respond again and finally the screen goes black and stucks there until I make a hard reset and it reboots normally, until it does it again, and again.
Relevant information:
16GB model, 1.5GB free storage available, sideloaded a few android apps today, recorded a few videos
the device manager software on the pc makes no difference, as the PB will anyway freeze and go all black even if it's backing up or something.
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Make sure any important data is backed up preferably by drag and drop to a pc.
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Macbook Pro screen is black and will not shut down or boot up right.

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The lights on the battery are lit up. I tried taking the battery out but same thing.
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Try:
Intel-based Macs: Resetting the System Management Controller (SMC)
Resetting your Mac's PRAM and NVRAM
Then see if it will boot into Safe Mode. Do not remove the battery unless it's defective.
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IMac screen is black. Will not turn on via remote keyboard or mouse?

iMac screen is blank. Can not turn on with remote keyboard or mouse. Any suggestions?

Hey Paul2046,
Thanks for the question. I understand you are experiencing issues with your iMac. The following resource may provide a solution:
Troubleshooting: My computer won't turn on
http://support.apple.com/kb/TS1367
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Hi charlezr,
I see that your monitor goes blank after you start up the computer, and I would be happy to assist you! To begin, I will need to ask you a few questions:
What is the Product and Model Number of your desktop computer and monitor?
What version of Windows do you have installed on your computer?
Is this an on-going, or recent issue?
In the meantime, I recommend following this document on when the Monitor or TV is Blank after Starting the Computer. This should help you determine if the blank screen is being caused by the computer hardware, the video signal to the monitor, or the monitor itself.
Please re-post with the results of your troubleshooting, as well as the requested information above. I look forward to your reply!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

Z10 screen went black and will not reboot

My wife updated her Verizon Z10 about a week ago and since then she's encounter a couple of times where the screen would go black and she'd have to do a battery pull to reset the device. With this morning's latest epsiode, pulling the battery did not work. I can't get it to reboot, nor can I seem to reinstall the device software. The red light will come on briefly and nothing else.
I checked the BTSC and have not found anything regarding this issue. Unfortunately, she did not back up her device and BB protect no longer provides this option so she lost some key documents. At this point, I'm hoping there is a way to salvage the device but it's not looking good.

916keneke wrote:
I tried both suggestions and was unable to revive the device. I certainly appreciate your help!
Hmmm...well, the first test (4h15m) is one to see if you can revive your device with it's same battery. But the 2nd test (battery swap) is intended to determine if the battery or the device might be causal to the problem.
Unfortunately, from your report, I cannot determine the precise result of the 2nd test. Your report might mean that your device did not work with that other "known good" battery...but it gives no hint of what happened with the other device using your battery. The complete result would be more useful in understanding what is happening in your situation. It may well be that your device is truly dead...but, from the information available here, I cannot come to that conclusion.
916keneke wrote:
Is there a way for me to reload the OS (maybe an earlier build) so that I can salvage the device? I've been reading about an Autoloader. Not sure if that will work as my device is unresponsive.
If the device will not run, then it cannot interact with the computer via USB. If it cannot interact with the computer via USB, then there is no way for the computer to load the OS to it.
Further, AutoLoaders are 100% destructive to any data residing on the device...so if your intent is to salvage data (rather than salvage the device), then an AutoLoader is not the right choice, even if it could be run (which, from what you describe, it cannot).
Good luck and let us know!
Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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HT201177 IMac screen goes black and will not return without power cycle. Time of events 19 min to 43 seconds after desktop shows

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