Backlight turning off randomly

I have a late 2009 27" 2.66 iMac (latest OS and updates). Just the other day the backlight started turning off randomly (can still see screen under a light). I have corners enabled and can put the display to sleep, wake it again and the backlight turns back on, but only for a short time. And I have a second monitor plugged in with no problems on that.
I've read that it may need new hardware which I don't really want to be forking out on. I've tried the other things of reseting the PRAM and SMC with no luck.
I've tried to boot AHT to run a diagnostic but for some reason whatever I do I can't get it to run.
Anyone have any suggestions?

It's probably a connection if it does it a lot when moving it. If it's out of warranty, you could use one of these guides to open it up and check for lose wires or connections.
-Bmer
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Macbook unibody backlight turns off while booting to 10.7

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My Macbook Pro (15 Inch) turns off randomly!!

My Macbook Pro (15 Inch) turns off randomly (Usually when it triggers graphic card)
Here I have a problem report. can anyone tell me what is happening????
Interval Since Last Panic Report: 45976 sec
Panics Since Last Report:          15
Anonymous UUID:                    674ECA2E-A451-E88A-AB3B-EFBF7EDC1E9E
Sun May 12 23:22:40 2013
panic(cpu 0 caller 0xffffff7f9c3a8b25): NVRM[0/1:0:0]: Read Error 0x00000100: CFG 0xffffffff 0xffffffff 0xffffffff, BAR0 0xd2000000 0xffffff80bad36000 0x0a5480a2, D0, P3/4
Backtrace (CPU 0), Frame : Return Address
0xffffff808bbfb7e0 : 0xffffff801bc1d626
0xffffff808bbfb850 : 0xffffff7f9c3a8b25
0xffffff808bbfb8e0 : 0xffffff7f9c4a24b3
0xffffff808bbfb940 : 0xffffff7f9c4a2527
0xffffff808bbfb9b0 : 0xffffff7f9c7b7853
0xffffff808bbfbaf0 : 0xffffff7f9c4c8659
0xffffff808bbfbb20 : 0xffffff7f9c3b28da
0xffffff808bbfbbd0 : 0xffffff7f9c3adfac
0xffffff808bbfbdc0 : 0xffffff7f9c3af9ba
0xffffff808bbfbea0 : 0xffffff7f9c3431c4
0xffffff808bbfbef0 : 0xffffff7f9de4971f
0xffffff808bbfbf40 : 0xffffff7f9de488e7
0xffffff808bbfbf60 : 0xffffff801bc3dcde
0xffffff808bbfbfb0 : 0xffffff801bcb26b7
      Kernel Extensions in backtrace:
         com.apple.NVDAResman(8.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f9c341 000->0xffffff7f9c643fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f9c2af000
            dependency: com.apple.iokit.IONDRVSupport(2.3.5)[86DDB71C-A73A-3EBE-AC44-0BC9A38B9A44]@0xff ffff7f9c32d000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.5)[803496D0-ADAD-3ADB-B071-8A0A197DA53D]@0 xffffff7f9c2ea000
         com.apple.nvidia.nv50hal(8.0)[9F3D09B5-3158-3D9E-BDA3-E71576AAD3B7]@0xffffff7f9 c651000->0xffffff7f9c973fff
            dependency: com.apple.NVDAResman(8.0.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f9c3 41000
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f9c2af000
         com.apple.driver.AGPM(100.12.69)[FBC949AC-F94D-39CD-96A0-C6F121EA7546]@0xffffff 7f9de47000->0xffffff7f9de56fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f9c2af000
            dependency: com.apple.driver.IOPlatformPluginFamily(5.2.0d16)[3E8EEB7F-E05E-33DD-96B6-9DAFA EB4997B]@0xffffff7f9cdec000
            dependency: com.apple.iokit.IONDRVSupport(2.3.5)[86DDB71C-A73A-3EBE-AC44-0BC9A38B9A44]@0xff ffff7f9c32d000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.5)[803496D0-ADAD-3ADB-B071-8A0A197DA53D]@0 xffffff7f9c2ea000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
12C60
Kernel version:
Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333
Kernel slide:     0x000000001ba00000
Kernel text base: 0xffffff801bc00000
System model name: MacBookPro6,2 (Mac-F22586C8)
System uptime in nanoseconds: 1445307590702
last loaded kext at 32394222521: com.apple.driver.AudioAUUC          1.60 (addr 0xffffff7f9d656000, size 32768)
last unloaded kext at 230040050490: com.apple.driver.AppleUSBUHCI          5.2.5 (addr 0xffffff7f9cc27000, size 65536)
loaded kexts:
com.apple.driver.AudioAUUC          1.60
com.apple.driver.AppleHWSensor          1.9.5d0
com.apple.driver.AGPM          100.12.69
com.apple.driver.AppleMikeyHIDDriver          122
com.apple.driver.AppleHDA          2.3.1f2
com.apple.iokit.IOUserEthernet          1.0.0d1
com.apple.driver.AppleUpstreamUserClient          3.5.10
com.apple.GeForce          8.0.0
com.apple.iokit.IOBluetoothSerialManager          4.0.9f33
com.apple.iokit.BroadcomBluetoothHCIControllerUSBTransport          4.0.9f33
com.apple.driver.AppleMikeyDriver          2.3.1f2
com.apple.driver.AppleIntelHDGraphics          8.0.0
com.apple.driver.AppleSMCPDRC          1.0.0
com.apple.Dont_Steal_Mac_OS_X          7.0.0
com.apple.driver.AppleSMCLMU          2.0.2d0
com.apple.driver.ApplePolicyControl          3.2.11
com.apple.driver.ACPI_SMC_PlatformPlugin          1.0.0
com.apple.driver.AppleIntelHDGraphicsFB          8.0.0
com.apple.driver.SMCMotionSensor          3.0.2d6
com.apple.driver.AppleLPC          1.6.0
com.apple.filesystems.autofs          3.0
com.apple.driver.AppleMuxControl          3.2.11
com.apple.driver.AppleMCCSControl          1.0.33
com.apple.driver.AppleUSBTCButtons          235.4
com.apple.driver.AppleUSBTCKeyboard          235.4
com.apple.driver.AppleIRController          320.15
com.apple.driver.AppleUSBCardReader          3.1.0
com.apple.iokit.SCSITaskUserClient          3.5.1
com.apple.AppleFSCompression.AppleFSCompressionTypeDataless          1.0.0d1
com.apple.AppleFSCompression.AppleFSCompressionTypeZlib          1.0.0d1
com.apple.BootCache          34
com.apple.driver.XsanFilter          404
com.apple.iokit.IOAHCIBlockStorage          2.2.2
com.apple.driver.AirPort.Brcm4331          602.15.22
com.apple.driver.AppleUSBHub          5.2.5
com.apple.driver.AppleAHCIPort          2.4.1
com.apple.driver.AppleFWOHCI          4.9.6
com.apple.iokit.AppleBCM5701Ethernet          3.2.5b3
com.apple.driver.AppleUSBEHCI          5.4.0
com.apple.driver.AppleSmartBatteryManager          161.0.0
com.apple.driver.AppleEFINVRAM          1.6.1
com.apple.driver.AppleACPIButtons          1.6
com.apple.driver.AppleRTC          1.5
com.apple.driver.AppleHPET          1.7
com.apple.driver.AppleSMBIOS          1.9
com.apple.driver.AppleACPIEC          1.6
com.apple.driver.AppleAPIC          1.6
com.apple.driver.AppleIntelCPUPowerManagementClient          196.0.0
com.apple.nke.applicationfirewall          4.0.39
com.apple.security.quarantine          2
com.apple.driver.AppleIntelCPUPowerManagement          196.0.0
com.apple.driver.DspFuncLib          2.3.1f2
com.apple.iokit.IOAudioFamily          1.8.9fc10
com.apple.kext.OSvKernDSPLib          1.6
com.apple.iokit.IOSurface          86.0.3
com.apple.iokit.IOSerialFamily          10.0.6
com.apple.iokit.AppleBluetoothHCIControllerUSBTransport          4.0.9f33
com.apple.iokit.IOBluetoothFamily          4.0.9f33
com.apple.iokit.IOFireWireIP          2.2.5
com.apple.driver.AppleHDAController          2.3.1f2
com.apple.iokit.IOHDAFamily          2.3.1f2
com.apple.nvidia.nv50hal          8.0.0
com.apple.NVDAResman          8.0.0
com.apple.driver.AppleSMBusPCI          1.0.10d0
com.apple.driver.IOPlatformPluginLegacy          1.0.0
com.apple.driver.AppleSMC          3.1.4d2
com.apple.driver.IOPlatformPluginFamily          5.2.0d16
com.apple.kext.triggers          1.0
com.apple.driver.AppleGraphicsControl          3.2.11
com.apple.driver.AppleBacklightExpert          1.0.4
com.apple.iokit.IONDRVSupport          2.3.5
com.apple.driver.AppleSMBusController          1.0.10d0
com.apple.iokit.IOGraphicsFamily          2.3.5
com.apple.driver.AppleUSBHIDMouse          175.8
com.apple.driver.AppleHIDMouse          175.8
com.apple.driver.AppleUSBMultitouch          235.7
com.apple.iokit.IOUSBHIDDriver          5.2.5
com.apple.iokit.IOSCSIBlockCommandsDevice          3.5.1
com.apple.iokit.IOUSBMassStorageClass          3.5.0
com.apple.driver.AppleUSBMergeNub          5.2.5
com.apple.driver.AppleUSBComposite          5.2.5
com.apple.iokit.IOSCSIMultimediaCommandsDevice          3.5.1
com.apple.iokit.IOBDStorageFamily          1.7
com.apple.iokit.IODVDStorageFamily          1.7.1
com.apple.iokit.IOCDStorageFamily          1.7.1
com.apple.iokit.IOAHCISerialATAPI          2.5.0
com.apple.iokit.IOSCSIArchitectureModelFamily          3.5.1
com.apple.iokit.IO80211Family          500.15
com.apple.iokit.IOAHCIFamily          2.2.1
com.apple.iokit.IOUSBUserClient          5.2.5
com.apple.iokit.IOFireWireFamily          4.5.5
com.apple.iokit.IOEthernetAVBController          1.0.2b1
com.apple.iokit.IONetworkingFamily          3.0
com.apple.iokit.IOUSBFamily          5.4.0
com.apple.driver.AppleEFIRuntime          1.6.1
com.apple.iokit.IOHIDFamily          1.8.0
com.apple.iokit.IOSMBusFamily          1.1
com.apple.security.sandbox          220
com.apple.kext.AppleMatch          1.0.0d1
com.apple.security.TMSafetyNet          7
com.apple.driver.DiskImages          344
com.apple.iokit.IOStorageFamily          1.8
com.apple.driver.AppleKeyStore          28.21
com.apple.driver.AppleACPIPlatform          1.6
com.apple.iokit.IOPCIFamily          2.7.2
com.apple.iokit.IOACPIFamily          1.4
com.apple.kec.corecrypto          1.0
Model: MacBookPro6,2, BootROM MBP61.0057.B0F, 2 processors, Intel Core i7, 2.66 GHz, 4 GB, SMC 1.58f16
Graphics: Intel HD Graphics, Intel HD Graphics, Built-In, 288 MB
Graphics: NVIDIA GeForce GT 330M, NVIDIA GeForce GT 330M, PCIe, 512 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x31364A53463235363634485A2D3147314631
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1067 MHz, 0x802C, 0x31364A53463235363634485A2D3147314631
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x93), Broadcom BCM43xx 1.0 (5.106.98.81.22)
Bluetooth: Version 4.0.9f33 10885, 2 service, 11 devices, 1 incoming serial ports
Network Service: AirPort, AirPort, en1
Serial ATA Device: Hitachi HTS545050B9SA02, 500.11 GB
Serial ATA Device: MATSHITADVD-R   UJ-898
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfa100000 / 2
USB Device: USB2.0 Hub, 0x05e3 (Genesys Logic, Inc.), 0x0608, 0xfa140000 / 6
USB Device: Apple Optical USB Mouse, apple_vendor_id, 0x0304, 0xfa143000 / 10
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x0236, 0xfa120000 / 5
USB Device: Internal Memory Card Reader, apple_vendor_id, 0x8403, 0xfa130000 / 4
USB Device: BRCM2070 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 3
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x8218, 0xfa113000 / 8
USB Device: hub_device, 0x0424 (SMSC), 0x2514, 0xfd100000 / 2
USB Device: Built-in iSight, apple_vendor_id, 0x8507, 0xfd110000 / 4
USB Device: IR Receiver, apple_vendor_id, 0x8242, 0xfd120000 / 3

Welcome to Apple Support Communities
You have a Mid 2010 15-inch MacBook Pro and your log is showing a problem with the NVIDIA graphic.
HansanL wrote:
      Kernel Extensions in backtrace:
         com.apple.NVDAResman(8.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f9c341 000->0xffffff7f9c643fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f9c2af000
            dependency: com.apple.iokit.IONDRVSupport(2.3.5)[86DDB71C-A73A-3EBE-AC44-0BC9A38B9A44]@0xff ffff7f9c32d000
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            dependency: com.apple.NVDAResman(8.0.0)[A4C53A36-22B6-3075-82B9-9DE612A9C015]@0xffffff7f9c3 41000
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f9c2af000
         com.apple.driver.AGPM(100.12.69)[FBC949AC-F94D-39CD-96A0-C6F121EA7546]@0xffffff 7f9de47000->0xffffff7f9de56fff
            dependency: com.apple.iokit.IOPCIFamily(2.7.2)[B1B77B26-7984-302F-BA8E-544DD3D75E73]@0xffff ff7f9c2af000
            dependency: com.apple.driver.IOPlatformPluginFamily(5.2.0d16)[3E8EEB7F-E05E-33DD-96B6-9DAFA EB4997B]@0xffffff7f9cdec000
            dependency: com.apple.iokit.IONDRVSupport(2.3.5)[86DDB71C-A73A-3EBE-AC44-0BC9A38B9A44]@0xff ffff7f9c32d000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.5)[803496D0-ADAD-3ADB-B071-8A0A197DA53D]@0 xffffff7f9c2ea000
These computers have got a damaged NVIDIA graphic which may cause unexpected restarts, kernel panics, black screens... See > http://support.apple.com/kb/TS4088
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Meghan_Horan wrote:
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Wait for the Apple logo to Appear...
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Release the Buttons...
2) Also consider Deleting any Apps you have Purchased / Downloaded but you now never use...
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iTunes free download from www.itunes.com/download
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http://support.apple.com/kb/HT1414

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Hi,
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Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.
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The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. Test while in safe mode. Same problem? After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

Why does my Satellite C655D-S5300 turn off randomly after about 45 minutes to 1.5 hours

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Solved!
Go to Solution.

Hi Peter,
Well, I finally gave up and took it into a professional repair place who simply updated the BIOS and that solved the problem. Runs like a champ now. I should have checked that before taking it in...would have been a quick fix and saved
$100. Oh well, thanks for the reply.
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Hey Tiffy6996!
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http://support.apple.com/kb/ts2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
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The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Thanks for coming to the Apple Support Communities!
Cheers,
Braden

Iphone 4 turns off randomly and won't turn back on unless it's plugged in

Iphone 4 turns off randomly and won't turn back on unless it's plugged in.
Has anyone had this problem?
If I leave the phone (thus not doing anything to it) for an extended period of time say 2 hrs. It will have turned off and you can't turn it back on unless you plug it in, but it's got heaps of "Battery" left.
Ever so often it will turn off randomly as well, and can't turn it on again.

If your iPhone is powering off, this is not normal.
Try restoring your iPhone with iTunes as a new iPhone or not from your iPhone's backup. If no change after doing so, your iPhone has a hardware problem. The iPhone includes a one year warranty.

IPhone 4 turns off randomly, and doesn't start up unless its on the charger. Hard resetting it when its turned off doesn't turn it on either.

My iPhone 4 is running iOS 4.3.4 and it suddenly turns off randomly, usually when the batery is around 85% or so. When I try to turn it on the normal way or hard resetting it, it doesn't turn on. It only turns on when its connected to a charger, and the time and date resets to 7.30am, January 1st 1970. I have no idea why is this happening and how do I resolve this issue? I really don't want to go get it replaced as its too much of a hassle and Im leaving to another country in 2 days time..

It also starts charging at 70% or so when it turns on..

5th Gen 60GB ipod turns off randomly

My iPod has a tendency to just turn off randomly. it'll leave a "ghost" screen shot of what was on it and then it slowly fades away to nothing. Then, the black screen and apple come up and take 20-30 seconds to reboot and start over at the main menu.
Any idea as to how to fix this?
thanks

My 5th Gen 80GB ipod also turns off/restarts randomly after about 2-3 minutes of use. Very annoying and have had much trouble in trying to solve this problem.

My 8350i turns off randomly

My 8350i start to turn off randomly a lot of times
The OS is
BlackBerry Handheld Software v5.0.0.1737 (Multilanguage)
Package Version: 5.0.0.1737
Consisting of:
Applications: 5.0.0.1074
Software Platform: 3.2.0.34
I didn´t istall any extra aplication and the meromy is clear , don´t have any picture,aditional file...
I read about this problem in many fourums and I reload the OS many times
it´s a question of harware? product quality?
what´s going on?
The problem persist

It doesn't matter how long you've been running the computer, the heat can build up fast. On my iMac, I can shut my computer down overnight, boot it up in the morning, and the temp on the CPU will be around 114 degrees F. However, if I start to do anything intensive like rendering video or playing a game full screen the temp reaches the point where the fans have to kick in high gear w/in about 5 minutes. So 30 minutes is plenty of time to get the heat built up. Besides, I think that the new C2D's are supposed to run cooler, so that means that the temp limit will be reached faster.
Also, like myhighway suggested, the RAM might be insufficient enough to do graphics-intensive tasks or other RAM utilizing tasks. When I got my iMac, it had 512 MB of RAM. That barely cut it for rendering video. Even with 512, it took over 2 hours to render just an hour of video. After that I got another 512 stick from Apple, and the rendering is real-time now. Also like myhighway suggested, the 3rd party RAM you put in there could be faulty, leaving your computer with just 512 MB of usefull RAM.
Hope this helps
Trevor

Backlight turning off randomly

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