Mac sound, LED lights, fan spins, then nothing... screen stays dead.

My eMac just 'died'. Any ideas?
Pressing the power button gives me:
- the start-up sound
- the fan starts
- the LED on the front lights up
but that's it! NOTHING else will happen.
There is:
- No optical USB mouse lights
- No keyboard reactions like eject button
- No Cmd-Option-P-R reboots
- No booting from CD with C or Shift
- Nothing else!
I've also tried:
- Replacing the battery (which WAS dead)
- resetting the PMU
- reseating the ram sticks
Other notes:
- holding power button down WILL force power off
- holding power button down while booting will provide firmware loading beep

Hi JMVP,
Thanks for the response!
I've left the eMac unplugged and completely stripped of peripherals (including the keyboard) for weeks, and when powering it up again, it's still acting the same.
I am, however, going to do exactly as you instructed, since there's nothing to lose by doing it. I'll keep you posted.
... toddj
eMac 700 Mac OS X (10.2.x)

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