Screen randomly going black

every now and then my screen will become black. sometimes i cans till sorta see the image that had been on the screen. if i close the screen down and wait for the little white blinking light to come on that indicates it is sleeping and then reopen it is normal again.
any ideas?
~ michelle

You can adjust the settings that regulate this in System Preferences -> Energy Saver -> Sleep->
Where it says "Put the display to sleep when the computer is inactive for:" you can choose increase or decrease the time interval before the screen will turn black.

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Hello Clinton
Thank you for your prompt response. I took an appointment with Genius Bar. Yes, this is a brand new laptop purchased it online through Apple website and received it on May 29th. I started noticing this issue from last week and it is happening at least 4 to 5 times in a day.
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Is there a problem with my graphics card, my screen randomly goes black?

Hi all,
I've been noticing that my laptop screen randomly blacks out though the device still appears to be on. I end up doing a full shut down by pressing the power button for 5 seconds and restart thereafter. Although this has happened at various times, it most recently has been occurring while using Google Chrome. Right before the screen blacks, I tend to see a prompt in the upper right hand corner of the screen that says something like "Intel HD Graphics now in use" or something about gfxCardStatus. Obviously for now I've been limiting the use of Google Chrome, but I'd still like to know if there is a substantial problem here. I'm using a Macbookpro 15in OSX version 10.7.4, i5 intel core processor. After restarting, this is the error message that I receive and report to apple:
Interval Since Last Panic Report: 227498 sec
Panics Since Last Report:          5
Anonymous UUID:                    269D36CF-8BA3-40BF-A749-409AC5A9A89C
Wed Jul 11 10:04:03 2012
panic(cpu 3 caller 0xffffff7f809ab947): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff809f18f000 0x0a5480a2, D0, P3/4
Backtrace (CPU 3), Frame : Return Address
0xffffff807c133060 : 0xffffff8000220792
0xffffff807c1330e0 : 0xffffff7f809ab947
0xffffff807c133170 : 0xffffff7f80a9baa4
0xffffff807c1331c0 : 0xffffff7f80a9bb64
0xffffff807c133220 : 0xffffff7f80d48749
0xffffff807c133360 : 0xffffff7f80ababed
0xffffff807c133390 : 0xffffff7f809b52c2
0xffffff807c133440 : 0xffffff7f809b0bc4
0xffffff807c133630 : 0xffffff7f809b16ed
0xffffff807c133710 : 0xffffff7f817d0000
0xffffff807c133760 : 0xffffff7f81795b2e
0xffffff807c133780 : 0xffffff7f817b670c
0xffffff807c1337b0 : 0xffffff7f817b6494
0xffffff807c133800 : 0xffffff7f817b67ce
0xffffff807c133820 : 0xffffff7f817e92f9
0xffffff807c133850 : 0xffffff7f817eb7bb
0xffffff807c133880 : 0xffffff7f817a30b0
0xffffff807c133a40 : 0xffffff7f817ebf68
0xffffff807c133b00 : 0xffffff7f817a0119
0xffffff807c133b60 : 0xffffff800065501e
0xffffff807c133b80 : 0xffffff80006558fa
0xffffff807c133be0 : 0xffffff800065609b
0xffffff807c133d20 : 0xffffff80002a3f08
0xffffff807c133e20 : 0xffffff8000223096
0xffffff807c133e50 : 0xffffff80002148a9
0xffffff807c133eb0 : 0xffffff800021bbd8
0xffffff807c133f10 : 0xffffff80002af150
0xffffff807c133fb0 : 0xffffff80002da6ce
      Kernel Extensions in backtrace:
         com.apple.NVDAResman(7.1.8)[560E1257-BF5E-3B0B-95F0-15033A0D1B97]@0xffffff7f809 4b000->0xffffff7f80c24fff
            dependency: com.apple.iokit.IOPCIFamily(2.6.8)[F63D4ABE-42DA-33EF-BADD-3415B0CB0179]@0xffff ff7f80802000
            dependency: com.apple.iokit.IONDRVSupport(2.3.2)[D05CFB53-FB72-3613-8162-2D188DB04738]@0xff ffff7f80939000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.2)[2D2A4A31-EB4F-3730-BE3A-76C061685FC5]@0 xffffff7f80901000
         com.apple.nvidia.nv50hal(7.1.8)[7596DB8C-AE9D-3C87-B11A-0ED8F940CAF8]@0xffffff7 f80c25000->0xffffff7f80f46fff
            dependency: com.apple.NVDAResman(7.1.8)[560E1257-BF5E-3B0B-95F0-15033A0D1B97]@0xffffff7f809 4b000
         com.apple.GeForce(7.1.8)[00925AF3-22EE-3858-8BD3-06AE57DFCC86]@0xffffff7f817950 00->0xffffff7f81854fff
            dependency: com.apple.NVDAResman(7.1.8)[560E1257-BF5E-3B0B-95F0-15033A0D1B97]@0xffffff7f809 4b000
            dependency: com.apple.iokit.IONDRVSupport(2.3.2)[D05CFB53-FB72-3613-8162-2D188DB04738]@0xff ffff7f80939000
            dependency: com.apple.iokit.IOPCIFamily(2.6.8)[F63D4ABE-42DA-33EF-BADD-3415B0CB0179]@0xffff ff7f80802000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.2)[2D2A4A31-EB4F-3730-BE3A-76C061685FC5]@0 xffffff7f80901000
BSD process name corresponding to current thread: Google Chrome He
Mac OS version:
11E53
Kernel version:
Darwin Kernel Version 11.4.0: Mon Apr 9 19:32:15 PDT 2012; root:xnu-1699.26.8~1/RELEASE_X86_64
Kernel UUID: A8ED611D-FB0F-3729-8392-E7A32C5E7D74
System model name: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 103855761228
last loaded kext at 47290318130: com.apple.driver.AppleHWSensor          1.9.5d0 (addr 0xffffff7f81ec4000, size 28672)
loaded kexts:
com.rim.driver.BlackBerryUSBDriverInt          0.0.74
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.filesystems.autofs          3.0
com.apple.driver.AudioAUUC          1.59
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.iokit.IOBluetoothSerialManager          4.0.5f11
com.apple.driver.AGPM          100.12.42
com.apple.driver.AppleHDAHardwareConfigDriver          2.2.0f3
com.apple.driver.AppleUpstreamUserClient          3.5.9
com.apple.driver.AppleMCCSControl          1.0.26
com.apple.driver.AppleMikeyDriver          2.2.0f3
com.apple.driver.AppleTyMCEDriver          1.0.2d2
com.apple.driver.AppleHDA          2.2.0f3
com.apple.driver.AppleIntelHDGraphics          7.1.8
com.apple.driver.AppleIntelHDGraphicsFB          7.1.8
com.apple.driver.SMCMotionSensor          3.0.2d6
com.apple.driver.AppleSMCPDRC          5.0.0d0
com.apple.driver.AppleSMCLMU          2.0.1d2
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AudioIPCDriver          1.2.2
com.apple.GeForce          7.1.8
com.apple.driver.ACPI_SMC_PlatformPlugin          5.0.0d0
com.apple.driver.AppleMuxControl          3.0.16
com.apple.driver.AppleLPC          1.5.8
com.apple.driver.AppleBacklight          170.1.9
com.apple.driver.AppleUSBTCButtons          225.2
com.apple.driver.BroadcomUSBBluetoothHCIController          4.0.5f11
com.apple.driver.AppleIRController          312
com.apple.driver.AppleUSBCardReader          3.0.1
com.apple.driver.AppleUSBTCKeyEventDriver          225.2
com.apple.driver.AppleUSBTCKeyboard          225.2
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          33
com.apple.iokit.SCSITaskUserClient          3.2.0
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCISerialATAPI          2.0.3
com.apple.iokit.IOAHCIBlockStorage          2.0.3
com.apple.driver.AppleUSBHub          4.5.0
com.apple.driver.AirPort.Brcm4331          530.4.20
com.apple.iokit.AppleBCM5701Ethernet          3.1.2b2
com.apple.driver.AppleEFINVRAM          1.5.0
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleFWOHCI          4.8.9
com.apple.driver.AppleAHCIPort          2.3.0
com.apple.driver.AppleUSBEHCI          4.5.8
com.apple.driver.AppleUSBUHCI          4.4.5
com.apple.driver.AppleACPIButtons          1.5
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.6
com.apple.driver.AppleSMBIOS          1.8
com.apple.driver.AppleACPIEC          1.5
com.apple.driver.AppleAPIC          1.5
com.apple.driver.AppleIntelCPUPowerManagementClient          193.0.0
com.apple.nke.applicationfirewall          3.2.30
com.apple.security.quarantine          1.3
com.apple.driver.AppleIntelCPUPowerManagement          193.0.0
com.apple.kext.triggers          1.0
com.apple.iokit.IOSurface          80.0.2
com.apple.iokit.IOSerialFamily          10.0.5
com.apple.driver.DspFuncLib          2.2.0f3
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.iokit.IOFireWireIP          2.2.4
com.apple.iokit.IOAudioFamily          1.8.6fc17
com.apple.kext.OSvKernDSPLib          1.3
com.apple.driver.AppleHDAController          2.2.0f3
com.apple.iokit.IOHDAFamily          2.2.0f3
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.AppleSMC          3.1.3d8
com.apple.driver.IOPlatformPluginLegacy          5.0.0d0
com.apple.driver.ApplePolicyControl          3.0.16
com.apple.driver.AppleGraphicsControl          3.0.16
com.apple.driver.IOPlatformPluginFamily          5.1.0d17
com.apple.driver.AppleBacklightExpert          1.0.3
com.apple.nvidia.nv50hal          7.1.8
com.apple.NVDAResman          7.1.8
com.apple.iokit.IONDRVSupport          2.3.2
com.apple.iokit.IOGraphicsFamily          2.3.2
com.apple.driver.AppleUSBBluetoothHCIController          4.0.5f11
com.apple.iokit.IOBluetoothFamily          4.0.5f11
com.apple.driver.AppleFileSystemDriver          13
com.apple.driver.AppleUSBMultitouch          227.1
com.apple.iokit.IOUSBHIDDriver          4.4.5
com.apple.driver.AppleUSBMergeNub          4.5.3
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.2.0
com.apple.iokit.IOBDStorageFamily          1.6
com.apple.iokit.IODVDStorageFamily          1.7
com.apple.iokit.IOCDStorageFamily          1.7
com.apple.iokit.IOUSBUserClient          4.5.8
com.apple.iokit.IO80211Family          420.3
com.apple.iokit.IOEthernetAVBController          1.0.1b1
com.apple.iokit.IONetworkingFamily          2.1
com.apple.iokit.IOFireWireFamily          4.4.5
com.apple.iokit.IOAHCIFamily          2.0.8
com.apple.driver.AppleEFIRuntime          1.5.0
com.apple.iokit.IOHIDFamily          1.7.1
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          177.5
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          331.6
com.apple.driver.AppleKeyStore          28.18
com.apple.iokit.IOUSBMassStorageClass          3.0.1
com.apple.driver.AppleUSBComposite          4.5.8
com.apple.iokit.IOSCSIBlockCommandsDevice          3.2.0
com.apple.iokit.IOStorageFamily          1.7.1
com.apple.iokit.IOSCSIArchitectureModelFamily          3.2.0
com.apple.iokit.IOUSBFamily          4.5.8
com.apple.driver.AppleACPIPlatform          1.5
com.apple.iokit.IOPCIFamily          2.6.8
com.apple.iokit.IOACPIFamily          1.4
Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i5, 2.4 GHz, 4 GB, SMC 1.58f16
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 256 MB
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x80AD, 0x484D54313235533642465238432D47372020
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.198.4.20)
Bluetooth: Version 4.0.5f11, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS545032B9SA02, 320.07 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 5
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 8
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 4
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 3
Can someone please help? This is also my first time posting so forgive me if I have not provided customary information.
Thanks!

Looks like a failed graphics GPU. Run Apple's Hardware Test in extended mode 2-3 times back to back. If errors appear that confirms a hardware problem. The reason for running the test 2-3 times back to back is AHT does not always find errors on the first or second pass, however when it does find them it is correct.

MacBook Pro screen randomly turns black on me for no reason while I'm using it? What's wrong with my MacBook?

I have a MacBook Pro from 2009 and the screen randomly turns black on me for no reason while I'm using it? It takes anywhere from 5 seconds to 1 minute to turn back on and no matter what I do it just has to fix itself so idk if it is going in to sleep mode or what. Anyone know the issue? Thanks.

Run through them and stop after #16 or if the problem stops, or if something tells you something severe (like hardware test giving a error)
If you can backup your personal data off the machine, you should do that first.
Hardware issues we cant' fix, only a few things may fix it.
Software issues we can fix, but right now we don't know what is causing your issue as we can't see it obviously.
So your going through a process of elimination to try to give us a clue what's the problem and then we can advise a course of action.
If you feel this is way over your head, then just make a appointement with Apple and/or your local PC/Mac specialist.
We are only other uesrs here, helping other users.

I was using my iPhone 5 and the screen randomly went black. I can still hear incoming calls but the screen stays black and unresponsive and stays black. My lock button stopped working last week so I can't restart the phone. What can I do to solve this?

I had an appointment this morning with Apple to try and solve the problem with my lock button ranomly not working anymore and a few hours before my appointment with the Apple store i was using my phone and my screen randomly went black and stopped working. And the p.roblem now i cant use it. I tried restarting the phone but I can't restart it due to my lock button not working so i need help with a solution on what i can do. I missed my appointment today because i could no longer use my phone and i'm now stuck using my laptop. I did also try connecting it to my MacBook but the screen was still unresponsive and black. I rescheduled my appointment to Monday to see what is wrong with my button and screen but in the meanwhile i would like to know if there is anything i can do or if i would just have to wait until monday and take it in to Apple. Any help would be really appreciated as i am phonelss for now until i take it in to Apple in a few days. Thanks.

You wrote...
' What can I do to solve this'
What have you tried...?
The Basic Troubleshooting Steps are:
Restart... Reset... Restore from Backup... Restore as New...

Lenovo z50 screen keeps going black

I've had it for around 6 months with no problems, then in the last 48 hours, the screen keeps going black when I'm using it. It happens every 20-30 minutes. If I close the laptop lid and open it again, it works fine until the problem comes up again. I've tried downloading updates and placing a fan by it, but it keeps happening. Any ideas?

jacob51 wrote:
I've had it for around 6 months with no problems, then in the last 48 hours, the screen keeps going black when I'm using it. It happens every 20-30 minutes. If I close the laptop lid and open it again, it works fine until the problem comes up again. I've tried downloading updates and placing a fan by it, but it keeps happening. Any ideas?Try installing the video driver and energy management program.

IBook randomly goes black

Hi,
I have a probalem that happens every once in a while. (Maybe happens once every other day.) It seems when I am running on battery it happens more then not. Although it has happened while plugged into the wall.
The screen simply goes black and the computer does not respond at all. By that, I mean holding the power button down doesn't do anything to hard reset it. The only way I have been able to reset it and start it back up is by removing the battery then replacing it and starting back up normally.
When it happends on battery power I always watch the batt. indicator and make sure it has plenty of power, so its not going black casue of that.
Does anyone know what might be causing this?
Thanks
iBook G4 14" 1.33Ghz (Late 2004) Mac OS X (10.4)

My guess is the dreaded Video Card/Logic board failure, which is soo famos with these iBooks.

I dropped my ipod in coke. The screen keeps going black. Is there anything i can do?

i dropped my ipod in coke. The screen keeps going black. Is there anything i can do?

Your iPod is toast. No amount of dry rice is gonna help.
"Coke" and other carbonated drinks are acidic (carbonic acid), not to mention loaded with sugars and other nastiness.
The acid will "eat" metals, like the lead and tin in solder, most liquids will wreak havoc with the LCD display, and since "Coke" and its cousins are acidic, they are also good electrolytes and will conduct electricity.
You can try filing a claim against your home owner's insurace, but barring that, you're out of luck.

SCREEN OCCASIONALLY GOES BLACK

Hi: I have a Mini Intel, 512MB Ram. I use Safari and MS Word. Today, after having the Mini for about 9 months, the screen occasionally goes black, and stays that way for about 5-10 seconds. It occurs every so often, like about once every 10 minutes. I have repaired permissions, ran Yasu, checked the settings on Energy Saver, where I have the computer on all the time; the display is scheduled to go to sleep when the computer is not being used for 17 minutes; these are locked. I haven't had this problem before. I'd appreciate it if you could give me some suggestions as to what might be wrong and how to fix it. Thanks, Jerry.

Thanks so much for your replies. I haven't changed the monitor from its original settings; made sure the cables are in firmly; I use cables for all my peripherals. I checked the Console and I may have had a Kernel Panic (I don't know, but it said something about Kernels when the screen went black). Moving the mouse didn't hurry up its return to normal. So, I again ran Yasu. I've been on the computer now for about 20 minutes and so far it's been working fine. I'm very grateful for your quick replies and for your advice. Hopefully, it's fixed now. Best wishes, Jerry.

IMac 2011 screen unexpectedly goes black (to sleep), won't wake

I've been having an intermittent problem. I'm using an iMac (late 2011) with 10.7.3. I'm doing things on the computer or some process is going on when the screen instantly goes black (no dimming first). If a video was playing, I can still hear it playing, but pushing keys on the keyboard or mouse or pad does nothing to wake the screen. Sometimes pushing the power button a number of times will get the screen to come on, sometimes it won't. When the screen goes black, if an external drive was running and then stops, I can sometimes get the screen to come to live. Sometimes this black screen happens when I'm burning a DVD; when the DVD is finished, I can bring the screen to life. I thought one of my two external drives was bad, so I disconnected it. That seemed to help (though verifying the disk revealed no problems). But a few minutes ago, the screen instantly went black again; no dimming first. There have been times I thought this was associated with a new bit of software, but then it returns even after I delete the suspect software. Sometimes I have to use the power button to shut down the iMac then restart it. Once, I had to unplug and replug the iMac before I could get the computer to respond and the screen to return to life. I don't know if this is a hardware problem (internal or external), a software problem, or some combination...or something I haven't thought of, at all. Very annoying. Verified the internal drive, repaired permissions; no problems noted there.

Exactly the same issue here - same machine and OS. got so bad now that it blacks almost as soon as it comes on. Over the past few weeks I also experienced the flickering screen that others have complained about. The black screen only occured after installing latest update (7.3) - and I only installed this after earlier problems with the update reported by many users were sorted - but the flickering happened before so may be not relevant.
What's happening when you press the power button a couple of times is probably that you have 'use power button to put computer to sleep' selected in System Prefs. Henmce, 1 push puts it to sleep and 2nd wakes it up.
I have done all the usual checks plus power down, unplugged for 20 seconds and then restarted to reset the SMC (System Managemenmt Controller) but problem has recurred - normally after sleep.
Aplle did have a large batch of faulty LG screens apparently so maybe this is the poblem. Otherwise maybe graphics card issue,
Mine's off to a service centre tomorrow whilst it's still under warranty... will update when I get it back

My iMac 27inch screen keeps going black but everything is still running in the background? please help

My iMac 27inch screen keeps going black but everything is still running in the background? please help. I have read that apple are recalling 27inch iMacs....

Hello @DesCherryBomb,
I understand that you are having issues with your HP 2310m monitor going blank and/or flickering. I am providing you with some steps you can try below:
Step 1. Unplug the power cord from the back of the monitor and the wall
Step 2. Hold the power button down for at least one minute
Step 3. Plug the power cord back into the monitor and then into the wall outlet (not a power bar or surge protector)
Step 4. Press the Menu button on the monitor
Step 5. Navigate to the Factory Reset option and select it
If the above steps did not resolve your issue you can try the monitor on a computer or other device to see if the issue persists. Please call our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region. http://www8.hp.com/us/en/contact-hp/ww-phone-assist.html
Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

Since yesterday my Apple TV will not load the movies or tv at all. I select it from the home screen, it goes black, tries to load then goes back to the home screen. YouTube and Netflix works though. I've reset the Apple TV and the modem. No change. help?

Since yesterday my Apple TV will not load the movies or tv at all. I select it from the home screen, it goes black, tries to load then goes back to the home screen. YouTube and Netflix works though. I've reset the Apple TV and the modem. No change. Any ideas what the problem is?

Apple TV: Unable to access Movies, TV Shows, or other iTunes features after updating
http://support.apple.com/kb/TS4526

My iMac is less than one year old. Without warning, the screen suddenly goes black. It used to happen occasionally, but is now happening all the time without warning. What is Apple doing to correct the problem?

My iMac is less than one year old. Without warning, the screen suddenly goes black. It used to happen ocasionally, but now it happens all the time. Numerous people have posted about this issue. Why hasn't Apple solved the issue. For what I paid my computer, I expected more from the product than I have gotten. I was a PC person for years and most of my associates told me that I needed to get a mac...I am starting to regret having taken their advice.

Sorry you're having this problem.
A few years ago we had a similar issue on one of our machines, it was an early MacBook. Ended up being a cracked circuit connection on the motherboard. Changes in temperature caused the crack to expand and contract resulting in a shut-down followed by an automatic reboot. Sometimes over-and-over. I understood from AppleCare at the time that those symptoms could have also been any number of things including a intermittent issue with a powersupply.
If you take it back to the Apple Store at some point, I would ask them to have it run some CPU intensive tasks that closely resemble what you are doing when the screen goes black. It took us several try's to find the problem. Calling AppleCare each time to discuss it and troubleshoot before making the trips to the Apple Store really moved things along. In fact, it wasn't until the Apple Store had cracked the case from the inside that things kicked into a higher gear and AppleCare phone support sent out a pre-paid FedX package to send it to a refurbishing facility. Never a problem since and I know the people who have the machine today.
PS Can identify with the trip to the Apple Store, our closest one is in Knoxville, 2hrs from us.

Randomly Going Black

My computer has just been back to Apple for extensive warranty work. It now randomly goes black. It's like it's in some inbetween sleep/running mode. I can hear the hard-drive spinning if I put my ear on it, but it is totally non responsive. I don't think it's just a display issue, since if I try to hit the power button and press return (which should normally shut the machine down), nothing happens. The only thing that seems to work it a hard reboot. It then functions for anywhere from 2 minutes to 10 hours (most commonly <1 hr). Could this in any way be a software issue or do I have to send it back to Apple (for the 3rd time!)?
Thanks for any help you can give.<br>
1.33 GHz G4 Mac OS X (10.3.9) I GB DDR SDRAM

Make sure everything is unplugged from the USB ports except for Mac branded mouse and keyboard. If the problem goes away, start plugging USB devices back in one-by-one until the problem recurs.

Screen randomly going black

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