Start-up grey screen lock and waking issues

Hello, I've been having several problems with my iMac G5 that seemed to all start at the same time just in this last week:
1/ 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 following sleep thing . . .
2/ computer won't start up again after sleeping - EITHER screen remains black and fan noise is heard, OR screen image comes back but then distorts slightly, a dark gray washes over it, and a restart notice appears (also distorted).
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 disconnected - no dice
I have NOT tried Safe Boot - safe mode would turn off many of the functions I use most.
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 bite it and take it in?
Many thanks for your time in replying,
Corrie B.
iMac G5 Mac OS X (10.3.9) First Generation
iMac G5   Mac OS X (10.3.9)  

"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 bite it and take it in?"
Hi Corrie, welcome to Discussions. Unfortunately I think you hit the nail right on the head. I would find a way to get this done with extension program because paying to fix it maybe cost inhibitive. (could you ship it to a friend or relative in the USA and have them take it in)???
For the sleep/wake issue you can try resetting the SMU, read the link below and it will show you how. Good luck Bob
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