Won't Turn On After Motherboard Replacement

a bad cable fried the FW ports in my PowerMac G4 MDD, which caused all kinds of problems. so i got a new motherboard from ebay and put it in. installation went smoothly, but now the computer won't turn on. when i press the power button, the light flashes for a moment, but nothing happens.
i've triple checked to be sure i connected everything properly. i guess there is a chance that the motherboard from ebay is bad, but the guy said it was in perfect working condition.
so what should i check? any help is appreciated. thanks!

i discovered that it powered up with no battery...so i swapped out the battery for another, and it still didn't work. but on a hunch, i went and bought a brand new battery and put it in, and it worked. not sure why, because of the two batteries i tried, one was brand new already...hey, whatever. it took three batteries, but it's seems to be up and running again.

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No flames but it is not looking good. I have done dv6000 and dv9000 motherboards and I rank them as about the hardest laptop repairs I have done. Not for the newbie. Trying to power on a board with no CPU and fan in place should not have fried it in and of itself but the fact that you did that makes me question the entire technique you used. One screw in the wrong place or one touch at the wrong time CAN fry it.

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