Sleep causes vertical lines on G4 iMac (Flat Panel)

Hi.
I've installed Leopard on my Flat Panel iMac and everything seems fine - except that I cannot use the sleep function.
As soon as I enter sleep mode (timed or manual), the screen is filled with vertical lines before sleeping.
When I wake it up, even more lines appear, filling the screen completely. Though, keyboard commands etc. still work fine. Only the screen output is affected. The only solution I found is a hard reset and disabling sleep mode...
Does anyone have the same problem - and even better - found a solution?
Thanks,
Phillip

I've had exactly the same issue with a 17" Flat Panel iMac, 800Mhz. I would be interested if anyone comes up with a solution.

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At the Apple Icon at top left>About this Mac, then click on More Info, then click on Hardware> and report this upto but not including the Serial#...
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FAO: Moderators... iMac Flat Panel broken

Dear Moderators,
The Forum (ID=870) "Expanding your iMac (Flat Panel)" is coming up with 'Error' in both Safari and Firefox right now (so I don't think it's me).
This is also causing errors on the iMac Flat Panel Category page where no posts are being listed.
Thanks
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Don,
Thanks, nice to know it wasn't just me.
mrtotes
Message was edited by: mrtotes
Ah it seems all is well again....

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Here's a puzzler, how to improve reception on iMac Flat Panel, w/built-in airport card. I have done alot of research into cantennas and the like, including parabolic dishes etc. I am trying to connect to my friends open network a few houses away but get sporadic signal most of the time. Just for fun i took a piece of aluminum foil and fashioned a curved dish and saw the signal strength spike to more than double sometimes. Does anyone have any thoughts or suggestions on this. Since i am on the all in one iMac (the half sphere base style) Flat Panel i don't have the option of putting my antenna in a can, dish etc.
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Cheers

Sleep causes vertical lines on G4 iMac (Flat Panel)

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