Emachines t3410-
WinXP - when you plug it in, it immediately comes on, no pushing the power button to start. Both fans run, power button lights up, LED flashes yellow once or twice and goes dark, no beeps from motherboard. Screen never changes from black. Cannot get to BIOS, safe mode, etc.
Have tried: Took out the hd and slaved to another machine, copied all documents and reformatted. Hd now works in another tower.
Blew out dust from tower & motherboard, checked and reseated RAM and CMOS connections. Removed CMOS battery for 10 minutes.
I believe the MB has gone bad, but would like to know for sure that it's not something easily fixable. Any suggestions?

Sounds like the MB or CPU.. do you have a spare CPU be any chance? :-/

Also, try unplugging all except hardware you need (even the Hard disk). Are all the PINS on the CPU ok?

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