Imac blank screen. back light on. imac shows on TV. bad LCD?

hello, I have imac 21.5 late 09 modle A1311. this piece of garbage was working til one day started up with blank screen. we did nothing to it no changing of any parts.nothing connected to this imac. I called apple and as always they were no help at all. I took it to iphone911 they said it could be LCD or LCD connector. I don't think they know what they are doing much like Apple. I hooked up the imac to the TV with HDMI and everything showed up and was able to use it with the TV full accsess. this imac powers up and the back light (dark blue) comes on ummm not the blue u see when mac starts bthis is backlight!! after started but no video at all. could the LCD be bad even tho backlight comes on? what could it be if it's not the LCD? I'm going to buy LCD if it's but I wan't to make sure this is the fix. I put it on CL but very low offers so I want to sell it and get windows and NEVER EVER again buy anything apple makes total garbage I'm so mad spending $1500+ with no support, now thinking I could bought 3 nice laptops with winds but live and learn.

oh thank god I sold this piece of crap called imac and bought new HP win 8. nothing ever will enter my house that apple makes this is for sure.and nothing good comes out of an idiot who makes a computer in the garage after fail in fixing cars!!

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IMac blank screen at start up, just fan whirl.

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Simply put, after the startup chime there is nothing but a blank screen, no lights on the keyboard or monitor, none of the start up key combinations will do anything so I can't even open the disk tray to try a Tiger boot dvd.
After scanning these forums I learnt that the PMU may need resetting, so I did that, the actual pressing of the PMU didn't move it much so I hope I pressed hard enough, and turned it back on agin only to be met by that same blank screen.
So is my faithfull iMac G4 dead?
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Try things in Apple doc.#106464 for your startup issue.
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I have Slate 21 Pro. It is awsome all in one desktop with Android system. However it has the problem with sleep mode. Say I press power button to put it into sleep mode. The light on the power button change to red from white. But at some point, could be a couple of minutes or one hour, the screen back light will turn on though the screen is still dark (nothing displays). And at this time, the light on the power button will become white. And the worst thing is it'll never go back to sleep mode once it is in this state. I used a Electric Meter to test the power comsuption. At running time (when I use it and power button light in white), it consumes aournd 26 watts. At sleep time(power button light in red), it comsumes around 5 watts. At the state of dark screen with back light on ( the problemmatic state I describe above), it comsume almost the same as running time around 24 watts. This is too bad for an Android device. Though I'm able to pay the bill, but why should we waste energy and money? I report the problem. HP sent me another one. But the same problem there. I guess it is caused by the latest OS update. HP really should fix this. Does anyone has this issue? I'm so supprised that no one report this issue.

IMac blank screen on bootup after os update

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Since yesterday my iMac crashes with a blank screen (different colors, mostly blue) shortly after login. Booting in safe mode is fine though. Hardware test did not find any problems, also Windows Vista 32bit runs fine. I would restore a recent backup, but when I boot from the installation disk the screen turns white and freezes. I tried a PRAM reset and I took the power chord and everything off for several minutes. Still the same issues.
Console showed kernel panics. Please check the dump below.
Any suggestions on how to restore my iMac?
Thanks,
qgi
Thu Sep 10 23:07:15 2009
panic(cpu 0 caller 0x00C866A4): NVRM[0]: Read Error 0x00020400: BAR0 0xe2000000 0x6a08c000 0x092480a2 D0 P2/4
Backtrace (CPU 0), Frame : Return Address (4 potential args on stack)
0x5b41f868 : 0x12b4c6 (0x45f91c 0x5b41f89c 0x13355c 0x0)
0x5b41f8b8 : 0xc866a4 (0xeb6e80 0xeb6e80 0xe7b6d4 0x0)
0x5b41f918 : 0xf3fdf0 (0x7868004 0x7ddd804 0x20400 0xcc2d06)
0x5b41f958 : 0xf6386f (0x7ddd804 0x20400 0x5b41f988 0x898)
0x5b41f978 : 0xd596da (0x7ddd804 0x46ebc098 0x0 0x5b41f99c)
0x5b41f9a8 : 0xd47c99 (0x7ddd804 0x46ebc004 0x1 0x5b41f9ec)
0x5b41fa08 : 0xde91f3 (0x7ddd804 0x7a1c604 0xa9af880 0x0)
0x5b41fab8 : 0xde881b (0x7ddd804 0x7e29004 0x0 0x0)
0x5b41fb38 : 0xf28bc1 (0x7ddd804 0x7e29004 0x1a 0x2)
0x5b41fbb8 : 0xf29254 (0x7ddd804 0x7e29c04 0x400000 0x5b41fcdc)
0x5b41fd38 : 0xf5a3ed (0x7ddd804 0x7e29c04 0x0 0x0)
0x5b41fe88 : 0xddc495 (0x7ddd804 0x7a1c604 0x0 0x0)
0x5b41fed8 : 0xc86b60 (0x7ddd804 0x7a1c604 0x0 0x0)
0x5b41ff18 : 0x426bfb (0x0 0x7ec4c80 0x1 0x19fed4)
0x5b41ff68 : 0x425d58 (0x7ec4c80 0x71066b0 0x5b41ff98 0x136efd)
0x5b41ff98 : 0x425a3a (0x7545840 0x7124ec0 0x72f04a8 0x0)
Backtrace continues...
Kernel loadable modules in backtrace (with dependencies):
com.apple.nvidia.nv50hal(5.4.8)@0xecc000->0x111ffff
dependency: com.apple.NVDAResman(5.4.8)@0xc6d000
com.apple.NVDAResman(5.4.8)@0xc6d000->0xecbfff
dependency: com.apple.iokit.IONDRVSupport(1.7.3)@0xc5f000
dependency: com.apple.iokit.IOPCIFamily(2.6)@0x629000
dependency: com.apple.iokit.IOGraphicsFamily(1.7.3)@0xc25000
BSD process name corresponding to current thread: kernel_task
Mac OS version:
9L31a
Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:55:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_I386
System model name: iMac8,1 (Mac-F227BEC8)
System uptime in nanoseconds: 166442601961
unloaded kexts:
com.apple.driver.InternalModemSupport 2.4.0 - last unloaded 118040925185
loaded kexts:
com.vmware.kext.vmnet 2.0.5
com.vmware.kext.vmioplug 2.0.5
com.vmware.kext.vmci 2.0.5
com.vmware.kext.vmx86 2.0.5
com.apple.filesystems.msdosfs 1.5.5 - last loaded 149337141464
com.apple.driver.iTunesPhoneDriver 1.0
com.apple.driver.AppleHWSensor 1.9d0
com.apple.driver.IOBluetoothSCOAudioDriver 2.1.8f2
com.apple.filesystems.autofs 2.0.2
com.apple.filesystems.ntfs 2.1
com.apple.driver.AppleUpstreamUserClient 2.7.5
com.apple.iokit.IOBluetoothSerialManager 2.1.8f2
com.apple.driver.AppleHDA 1.7.1a2
com.apple.DontSteal_Mac_OSX 6.0.3
com.apple.iokit.CHUDUtils 201
com.apple.iokit.CHUDProf 211
com.apple.driver.AppleIRController 113
com.apple.GeForce 5.4.8
com.apple.driver.ACPISMCPlatformPlugin 3.4.0a17
com.apple.driver.AppleHDAController 1.7.1a2
com.apple.iokit.IOFireWireIP 1.7.7
com.apple.driver.AudioIPCDriver 1.0.6
com.apple.driver.AppleUSBAudio 2.6.4b17
com.apple.driver.AppleLPC 1.3.1
com.apple.driver.AppleBacklight 1.6.0
com.apple.nvidia.nv50hal 5.4.8
com.apple.driver.BroadcomUSBBluetoothHCIController 2.1.8f2
com.apple.driver.AppleHIDKeyboard 1.0.9b4
com.apple.iokit.IOUSBMassStorageClass 2.0.8
com.apple.driver.AppleUSBMergeNub 3.4.6
com.apple.iokit.IOSCSIMultimediaCommandsDevice 2.1.1
com.apple.iokit.SCSITaskUserClient 2.1.1
com.apple.driver.XsanFilter 2.7.91
com.apple.iokit.IOATAPIProtocolTransport 1.5.3
com.apple.driver.AppleUSBHub 3.4.9
com.apple.iokit.IOUSBUserClient 3.4.9
com.apple.iokit.IOAHCIBlockStorage 1.2.2
com.apple.iokit.AppleYukon2 3.1.13b2
com.apple.driver.AirPortBrcm43xx 366.91.21
com.apple.driver.AppleFWOHCI 3.9.7
com.apple.driver.AppleAHCIPort 1.7.0
com.apple.driver.AppleIntelPIIXATA 2.0.1
com.apple.driver.AppleUSBEHCI 3.4.6
com.apple.driver.AppleUSBUHCI 3.3.5
com.apple.driver.AppleEFINVRAM 1.2.0
com.apple.driver.AppleRTC 1.2.3
com.apple.driver.AppleHPET 1.4
com.apple.driver.AppleACPIPCI 1.2.5
com.apple.driver.AppleACPIButtons 1.2.5
com.apple.driver.AppleSMBIOS 1.4
com.apple.driver.AppleACPIEC 1.2.5
com.apple.driver.AppleAPIC 1.4
com.apple.security.seatbelt 107.12
com.apple.nke.applicationfirewall 1.6.77
com.apple.security.TMSafetyNet 3
com.apple.driver.AppleIntelCPUPowerManagement 76.2.0
com.apple.driver.DiskImages 199
com.apple.BootCache 30.4
com.apple.iokit.IOSerialFamily 9.4
com.apple.driver.DspFuncLib 1.7.1a2
com.apple.iokit.CHUDKernLib 201
com.apple.driver.IOPlatformPluginFamily 3.4.0a17
com.apple.driver.AppleSMC 2.3.1d1
com.apple.iokit.IOHDAFamily 1.7.1a2
com.apple.iokit.IOAudioFamily 1.6.9fc5
com.apple.kext.OSvKernDSPLib 1.1
com.apple.NVDAResman 5.4.8
com.apple.iokit.IONDRVSupport 1.7.3
com.apple.iokit.IOGraphicsFamily 1.7.3
com.apple.driver.AppleUSBBluetoothHCIController 2.1.8f2
com.apple.iokit.IOBluetoothFamily 2.1.8f2
com.apple.iokit.IOUSBHIDDriver 3.4.6
com.apple.driver.AppleUSBComposite 3.2.0
com.apple.iokit.IOSCSIBlockCommandsDevice 2.1.1
com.apple.iokit.IOBDStorageFamily 1.5
com.apple.iokit.IODVDStorageFamily 1.5
com.apple.iokit.IOCDStorageFamily 1.5
com.apple.iokit.IOSCSIArchitectureModelFamily 2.1.1
com.apple.iokit.IO80211Family 216.1
com.apple.iokit.IONetworkingFamily 1.6.1
com.apple.iokit.IOFireWireFamily 3.4.9
com.apple.iokit.IOAHCIFamily 1.5.0
com.apple.iokit.IOATAFamily 2.0.1
com.apple.iokit.IOUSBFamily 3.4.9
com.apple.driver.AppleEFIRuntime 1.2.0
com.apple.iokit.IOSMBusFamily 1.1
com.apple.iokit.IOStorageFamily 1.5.6
com.apple.iokit.IOHIDFamily 1.5.5
com.apple.driver.AppleACPIPlatform 1.2.5
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Message was edited by: qgi
Message was edited by: qgi

HI,
Go here for help to Resolve Kernel Panics
Carolyn

No startup: blank screen, power light on, fans normal speed

iMac G5 2.0GHz, 2GB RAM, 160GB HD, OSX 10.5, 17". Bought in October of 2005. Two matched Samsung 1GB RAM chips installed quite some time ago with no problems.
While it isn't the iSight model, my iMac has done the blank screen with fast spinning fan thing a few times, but it always recovers after I turn it off. Here's what happened:
iTunes is playing, I pause it using the Play/Pause button on the new wireless aluminum keyboard, it sits for a while and the screensaver comes on. I press the Play/Pause button on the keyboard again, the screensaver freezes and the fans spin up to maximum speed. I hold the power button down, it shuts off, I turn it on again and get nothing. It now powers up to a blank screen, fans at normal speed, the power light stays on, and the CD drive never makes its little startup noise. Holding the power button down does nothing, I have to pull the power cable out to turn it off. The only thing it has done differently since this happened is one time the power light didn't come on, otherwise no change. I also tried all of the different key combinations on startup (using the USB keyboard) and get no response, so no target disc or safe modes. Also, the CD drive won't accept any discs, so I can't start from the system discs.
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First, you may still be eligible for one of Apple's Repair extension programs also, try resetting the SMU.
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I have a 2.0 Ghz Intel iMac (20") that had a crash during a game of Age of Empires (just about to win as well.... ). I tried to turn it back on again after a force shutdown and the hard drive whirred but there was no chime and the screen remained as black as it is when its off. The white power light on the front stays on solidly but after leaving it a few minutes, nothing happens! (Ive tried taking out all USB/Firewire devices except from the mouse and keyboard too)
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I'm used to opening up macs and changing bits and bobs and always take the necessary steps to avoid damaging components through static or other means regardless of if manuals have the warnings or not.
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Message was edited by: Lee_Head

IMac blank screen & three beeps!

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@SohaibAfzal
Have you tried connecting an external monitor to your notebook, to see if there is a display?
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Resolving Problems with Notebook Displays (Windows 7 and Windows 8)
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Diagnosing a Liquid Crystal Display (LCD) for Damage
This page is more informational about displays, for your reference.
About LCD Panel Defects and Terminology for HP Pavilion or Compaq Presario Notebook PCs
Malygris1
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 Kudos Thumbs Up on the right to say “Thanks” for helping!

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Imac blank screen. back light on. imac shows on TV. bad LCD?

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