Mac G5 Won't start no matter what I do!

I hope someone can please help. My mac has always ran perfectly fine and there was no sign of anything strange when i last shut it down. When I tried to turn it on this morning, I did not hear the chime and it didn't sound like the disc was turning at all, it just sits there with a dark screen and soon thereafter the fan turns on and starts running very loudly. I have to hold down the button to turn it off.
I've tried
- unplugging everything for 10 minutes to reset.
- reseting the PRAM
- starting from the back-up drive
- starting from the install disc
The result is always the same. Nothing happens! Is there anything else I can try? THis is very upsetting for me. I have some important data on my computer that hasn't been backed up. I really would like to figure out how to safely solve this problem.
Thanks for any advice,
Karen

Hi Allan,
I was afraid of that. Also, I found this thread by searching the boards and it sounds exactly like my problem. http://discussions.apple.com/thread.jspa?threadID=1072271&start=0&tstart=0
I took it to the apple store and am waiting for the diagnostic, but it doesn't look good. They are guessing it's the motherboard and estimated the repair to be close to $1000. For that price, i am considering the iMac. It is faster in every respect to my G5. It's amazing how technology has advanced in 3 years. Anyway, considering I haven't expanded my G5 in that time means I probably won't. Plus, i never have had an apple monitor which is obviously a major perk to the imac.
I am considering the 20" and will definitely increase the RAM to 2GB. It is my understanding that is the most important upgrade for video editing.
I don't know much about the Radeon video card and am curious if someone could tell me the benefit to getting the 2600 over the 2400.
Thanks and wish i had a better update on my poor G5. I must say, i am pretty disappointed something so major could go wrong with a 3 year old, well cared for machine.
Karen

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