Power Mac Dual G5 2Ghz won't start up

Hi,
Last night I was playing a DVD on my dual G5, and the superdrive started to make unusually loud, weird noises. I tried to restart the computer from the apple menu, but it wouldn't. Then I tried to force quit all my apps, but it wouldn't either. So I proceeded to push the power button for 5 secs. and that worked. Now the computer won't start. I tried resseting both the PRAM and the PMU, but it still won't start. All I get is the power light fading in and out, like it's breathing.
Any ideas or suggestions as to what may be going on?
Thank you ver much,
Daniel

I have the same problem with a different twist. I was playing a DVD based game last night, logged out to go to bed, then this morning the computer won't wake up, won't reboot, there's no fan or hard drive sounds, but the status light just glows, no flashes. The only way to turn it off was to unplug the system. When I plug the computer back in the light comes back on but it still won't start.
There was a power outage this morning and several over the last few days. Otherwise there were no other changes to my system. The most recent installations were Quake and Age of Empires III (the game referred to above).
Anyone have any ideas?

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Hi Radcock, and a Warm Welcome to Apple Discussions and the Power Mac G5 Forum!
Hopefully your data is backed-up.
You could try:
Disconnect everything from the G5 and let it stand for 30 mins.
Then connect only a display, wired keyboard and mouse, and the mains.
Reset the PMU/SMU (bottom of the page)
http://docs.info.apple.com/article.html?artnum=300341
Observe static precautions (keep one hand on the G5 casing and avoid clothing with unnatural fibres) and make sure to press the button once only.
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http://docs.info.apple.com/article.html?artnum=88215
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If it boots, you could run Disk Utility and see what it makes of your internal boot drive
http://docs.info.apple.com/article.html?path=DiskUtility/10.5/en/duh1018.html
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http://docs.info.apple.com/article.html?artnum=301269
and use only the most recent Disk Utility you have to repair your boot drive.
You may have to erase the internal drive and re-install OS X and combo up to 10.4.7
http://www.apple.com/support/downloads/macosxupdate1047comboppc.html
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Presuming that you are not seeing this screen
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Power Mac Dual G5 2Ghz won't start up

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