Help! - No signal with new mobo & graphics (crap title edited)

[cybo]

Ok, I need help, I'm stumped...

...here's the problem.

I had a PSU blow a coupla months ago (TAGEN 570w), so I went and bought a sparkle 700w as a replacement, plugged it all in, powered it up...

...No VGA detected on the mobo (DFI LanParty Ultra-D)

...damn, i thinks, "blown up my 7800 GTX card". So I plug in an identical working one from my second machine - still no VGA Detected.

...damn, i thinks, "blown the mobo", So I buy a replacement, and as I'm thinking of going SLI, I buy a DFI Lanparty Expert board...

...Plug it all together, STILL no VGA detected - I've tried 3 different graphics cards - no joy.

 

[cybo]

power lights on mobo, debug lights on mobo are two amber, two red (VGA not detected).

The CPU <em>did</em> work prior to the PSU blowup, but I don't have suitable another machine to test it in, however if I try to run the system with no CPU it doesn't even get past 4 red lights (No CPU detected...)

fans all spin up, even the VGA card fan...

(sorry bout the crap title!)