Help - problems waking up

Over the last week I have started to have problems waking up my iMac. The problem occurs randomly with the following symptoms: - the screen stays dark but the hard drive and fan start, with the fan gradually building to a dull roar.
I have reset the parameter RAM and SMU and done a safe mode boot which all seemed OK.
Any clues? Thanks.

Hello, I've been having several problems with my iMac G5 that seemed to all start at the same time:
1/ The problem under discussion - compunter won't start up again after sleeping - fan, noise etc. OR screen image comes back but then distorts slightly, a dark gray washes over it, and a restart notice appears (also distorted).
2/ Trouble starting computer - during start-up the usual tone is heard, then a grey screen appears and the start up process stops. I am forced to restart and try again. After several attempts the computer makes it to the grey apple logo and it finally starts up. The computer works perfectly once it is finally on all of the way - except for the sleep thing.
I have tried the follwing techniques to fix the problems:
- Disc Utility check: everything fine
- Hardware Test from disk: everything fine
- Re-set PRAM
- Tried starting holding down Option Key - had to shut down after endless wait
- Looked for new firmware - what I found didn't help
- Removed new Software - no change
- Tested with various peripherals unplugged - do dice
I have NOT tried Safe Boot - safe mode would turn off many of the functions I use most. Rendering the fix moot.
I'm not sure what else I can do. I am, of course, aware of the "Repair Extension Program for Video and Power Issues" but as I live in Japan, outside Tokyo, it is going to be a long haul to get my computer in to be looked at.
Could this be fixed any other way by me? Or does this sound like a classic "G5 power/video issue" and I should just take it in?
Many thanks for your time in replying,
Corrie B.
iMac G5 Mac OS X (10.3.9) First Generation G5 iMac
iMac G5   Mac OS X (10.3.9)  

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