OK, I killed it...  any suggestions? - topcase replacement issues

I'm really hoping someone can help...
I was given a 400 mhz powerbook 2 years ago which needed a new top case (broken from being dropped), which I successfully used since then.
I bought a replacement top case from ebay (used), which looked to be in fine shape, and proceeded to follow the directions to replace it. Now, I don't even get the grey screen. When I power it up, if I have an external fan in the usb slot, it will power up, suggesting that it is not the switch; but the only indication of any life whatever other than that is warming of the black heat exchanger below the keyboard. I would drop it back into the old case, except I don't want to do the whole thread the monitor cables through thing.
Any thoughts would be helpful - I have had the logic board back out twice looking for anything I might not have reconnected.
TIA,
Alan

ok, got it. I fiddled with the inverter connections, and now I have happymac again
thanks to all who took the time to look
A-

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