800 Mhz won't boot

We had an 800 Mhz emac that was sleeping when the power went out here at school. When the power came back on, the computer was still in sleep mode and would not wake up. After getting it shut down, it will not reboot. When powered on, you can hear the fan running, but nothing else. It will not boot from a CD, firewire drive, or in Target mode. No external video either. I have left it sit unplugged overnight, zapped the PRAM, reseated the RAM, replaced the CMOS battery, and reset the button inside. There is no airport card so that isn't the problem. Attempting to reset Open Firmware was done blind since there is no video (not even a gray screen). AppleCare expired in June. At first I immediately thought HD failure, but if that is the case, it should at least try to boot up, shouldn't it?. Any ideas? The secretary needs her computer back. Thanks

If the fan is powering up, it's not the switching power supply latching up, and you've already tried pulling the power cord from the side of the eMac for at least 30 minutes after unplugging all peripherals (that's how I read your "left it sit unplugged overnight"). You've already tried the known troubleshooting steps, including checking for video from the miniVGA out port, target disk mode, and external/CD drive bootup.
Does the power LED on the fron of the eMac come on? When you inserted the CD, did you hear or feel the disc spinning?
When you zapped the PRAM, did you hear any tones from the Mac?
About the only thing you haven't mentioned trying is replacing the eMac's keyboard/mouse with a known-good one from another USB Mac. I've never heard of a power outage damaging a keyboard (power surge, yes, but not outage), and if the USB ports had latched up, leaving the eMac unplugged overnight should've reset them, but that's about the only thing left you haven't already tried.
Good luck!

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