IMac 17" Flat screen - display remains black

Hi,
I've a IMac 17" Flat screen, and after he went into sleep, I cannot wake up my screen...! When I put on the mac, the screen becomes a little less black but that's all... Using external screen (video out on the IMac) gives good results on the other screen... Anyone knows what happens?
I've already reset PMU, PRAM is zapped (3 times), check cables, ...
Thanks,
Bart M.

Hi All,
The 'black screen upon wake from sleep' condition is on my daughter's 20" iMac G4 as well. This computer is a refurbished one ordered from the online Apple Store. Right out of the box it had the same problem as Brian described - electrical noise going across the screen (though only intermittantly) and gradually got worse until we now have only the black screen when it wakes up.
After a few calls, Apple Care said this is a 'known issue' with refubished 17" and 20" flat panel iMacs. They believe it is a software problem and they are seeking a solution. They recommend to disable sleep mode until they find a fix. No word on how or if we would be contacted when such a fix is available.
A local CompUSA (an authorized Apple repair center) tech said to bring it in, because it sounds to him like a problem with the inverter board. If so, it would be covered under the warranty. I wonder if this is a weakness with these iMac models. We'll be taking it in within the next couple weeks and will report the results.

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