IMac screen is black

I have a 17" iMac G5 ALS, recently the computer started up fine but after putting it to sleep the screen stays black. I've tried restarting and zapping PRAM but nothing gets the screen working.
I've plugged in an external monitor and I can see that everything else is working fine, any ideas on what I can do?

http://docs.info.apple.com/article.html?artnum=301287 My computer stops responding during startup
http://docs.info.apple.com/article.html?artnum=301733 iMac G5: How to Reset the SMU (iMac G5, the iMac G5 (Ambient Light Sensor), and the iMac G5 (iSight)).
Try running +repair disk+ from your *software install DVD* and afterwards, run +repair permissions+ *from your HD.*

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I had a problem with imac screen going black. apple store diagnosed prob with video card which they replaced. Brought it home, turned it on (have done this 4 times) it starts up, wheel turns, there is a long bar at bottom which fills up, then it turns off

I had a problem with imac screen going black. apple store diagnosed prob with video card which they replaced. Brought it home, turned it on (have done this 4 times) it starts up, wheel turns, there is a long bar at bottom which fills up, then it turns off

Apple guarantees their work, take it back.

Imac Screen gone black

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Thanks for your help BDAqua but I'm afraid the situation remains the same even after trying out your suggestion. I have taken a photo of the screen with my phone and this is photo is the best the screen can do. I hope it helps in diagnosing the problem

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Howdy OatsaMae,
It sounds like your screen is flashing unexpectedly on you for some reason. I would recommend this section from the following article to help you get that resolved, named:
Apple computers: Troubleshooting issues with video on internal or external displays
Reset the system
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Start up in Safe Mode.
From the Apple () menu, choose System Preferences.
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Thank you for using Apple Support Communities.
Take care,
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As old as your iMac is, have you cleaned out the dust? Dust buildup can lead to over heating issues. Remove any and all things plugged into it including the power cord, Remove the RAM access grille. Vacuum all openings starting with the RAM access area (air intake). Vacuum all ports and plugs, DVD slot and the opening across the top of the rear of the body. Blow compressed air through all your openings and vacuum again to remove any dust you loosend. Reinstall the RAM grille. Plug in the keyboard and mouse if not blue tooth. Insert power cord...
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SMC RESET
http://support.apple.com/kb/HT3964
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IMac screen went black. What now?

All was working well and then the screen on my iMac went black. PRAM reset did not help. Restarting indicated that the computer was on but the screen was black. Any suggestions? I am running a 27" iMac, 10.5.8 OS.

Try resetting the SMC http://support.apple.com/kb/HT3964
If that doesn't help you might consider taking it in for service.

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IMac screen is black, Resetting PRAM and NVRAM did not solve

Hi
My iMac screen just went black. I tried
Resetting PRAM and NVRAM and the SMC but it didn't help.
The computer starts up and shows the gray screen, but within a second it just turns black.
I need help please!
Thanks

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IMac screen is black

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