Imac G4 15" Screen Stays Black After Screen Saver Goes To Sleep

I have an imac G4 15" that I just got from a friend that works pretty well, except that after it goes from the screen saver into to sleep mode, the screen stays black. I can hear the error chimes when I try to awaken the screen with the keys, but the screen just stays black. I have tried to increase the brightness, etc. but to no avail. Eventually I have to resort to re-booting and I am afraid that at some point, either the computer won't reboot or one of my external hard drives will crash. Any advice from someone who has experience with this issue would be greatly appreciated.
THANKS!

Hello and Welcome to Apple Discussions.
Have a look at this user tip:
http://discussions.apple.com/thread.jspa?messageID=4349704
cheers
mrtotes

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!http://i45.tinypic.com/jl0z95.jpg!

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