I found a listing on ebay a short time after my problem occurred and ordered the new
board, it arrived and I installed...I press the keyboard startup key...nothing, any keyboard
combination, even front panel access, nothing, so I'm assuming the "replacement board"
is DOA.
Even if the board is dead (bad RAM, no CPU, main chipset ripped off the board, ROMs zeroed or removed, etc.) the machine should still power on when you apply the various methods of powering on. It may not chime, but the power supply should come on and any powered drives should spin up.
Power On functions are controlled by the CUDA chip (341S0788 or maybe 343S0788 near the back left corner of the board). It has it's own little 6502 processor inside that handles these things.
It is possible for a motherboard to fail to power up because the CUDA chip is toast, but it's a lot more likely for the power supply to be faulty or for there to be issues wtih how it's connected to the motherboard.
Jeff Walther
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