Dual G5 2.0 Power Mac (June 2004) referb - booting problem

Hi all - my dual G5 2.0 Power Mac (June 2004) decided to rev its fans and boot no more. When I push the power button in front, the white light comes on while pushing it, then goes off, yet I hear the fans starting, the hard drive spinning etc. The key board isn't getting power (the caps light doesn't go on) and after a few minutes the fans rev like a jet engine...starting slow then gaining speed. I can't open the DVD from the key board (have tried all usb ports). Have also looked through this discussion area and tried many of the solutions provided (reset the PMU, unplug, try different outlets etc.) Any help would be appreciated. I do have Applecare but they are closed for the night.
Thanks for you help
Dual G5 2.0 (June 2004) referb from Apple Mac OS X (10.4.6)

Your OS is not loading and the fans default into a speed up mode.
Power up and hold down the mouse button, the cd tray will spit. Insert Tiger/install disk and power boot holding c. (note: use a wired keyboard/mouse directly to the machine and nothing else for now)
In the Installer, select Disk Utility from the menu>Repair disk/permissions. note any errors you see.
If you can't access the drive, it might be dead. I hope you backed up files.
All you need to do is get a new drive and reinstall Tiger etc.
If you can get a 6 pin firewire 400 cable to each Mac and t boot the problem Mac. the hard drive should appear on the other which you can recover files.
If the OS is fried you can do a archive and install too.

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m-one
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2Z691-5306-A 1002481
Compatible with eMac (2005), iBook G4 (Late 2004), iBook G4 (Mid 2005), iMac G5 17-inch (ALS), iMac G5 20-inch (ALS), iMac G5 (17-inch iSight), iMac G5 (20-inch iSight), iMac (Early 2006 17-inch), iMac (Early 2006 20-inch), Mac mini, Mac mini (Late 2005), Mac mini (Early 2006), MacBook Pro, Power Mac G5 (Early 2005), Power Mac G5 (Late 2005), PowerBook G4 (15-inch
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http://www.welovemacs.com/2z6915306a.html

Dual G5 2.0 Power Mac (June 2004) referb - booting problem

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