IMac wont boot--black screen.

I have 2 iMacs (1.8gHz). Im familiar with the display problem with lines and artifacts.
So I sent both boards to a guy on ebay who fixes (replaces) the leaking capacitors for $50. (I wasnt going to pay $1000 to Apple)
I put installed the MBboards back in both Imacs.
One booted fine then to a crazy lined screen and froze. Subsequent restarts it got worse till now it sounds like its starting but NO display, just black.
The other iMac makes the start chime, then just seems to go dead to a black screen.
I order 2 inverter boards on eBay (new). Installed both.
Now both iMacs sound like they are running but display is totally black...
Whats going on? Stumped.

Steve-
Has your black screen iMac situation been resolved? I too have a very similar problem currently:
http://discussions.apple.com/thread.jspa?threadID=2203799&tstart=0

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