IMac won't wake up - Screen slowly fades to white

Dear everyone,
I love my iMac g4, it just has this one stupid little problem:
The computer will go to sleep just fine, but when I wake it up, the screen is colored all weird, full of lines, and the whole thing slowly fades into a lovely white. Then I have to reset.
I have tried cleaning up the system with Onyx, but short of that, I don't know what the problem is, or if it can be repaired.
Any advice?
Cheers,
Tyler
iMac G4 15" "USB 2.0" Mac OS X (10.4.5)
iMac G4 15" "USB 2.0" Mac OS X (10.4.6)

Hi,Welcome to Apple Discussions.
It sounds much like you are suffering the famous screen issues. Please see this link that not so much details a solution but rather things other's have tried - although the common issue is a fade to black not white....
I would suggest that the short term solution is to go to Apple Menu > System Preferences > Energy Saver > and set to never sleep. Try to see if turning on and off system, display and hard disk sleep options helps.
See this post which links to Apple's Service Manual and the associated troubleshooting guide.
mrtotes

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IMac won't wake up - Screen slowly fades to white

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