Asus P7P55-E LX No Video After Post

I can't work this one out, I have just finished building a new box and it appears to work fine except that I lose video output after the system finishes POST. If I go to the BIOS setup same issue occurs. The video card appears to just not output any video, I have tried reseating ram, different PSUs.
If I put a boot CD in it appears to boot and run but I don't get any video output.
This is my setup:
Intel Core i5 650
Corsair CMX4GX3M2A1600C9 4GB (2x XMS3 2GB) PC-12800
Asus P7P55D-E-LX
Antec EarthWatts 650W

Any Ideas?

PS - I have tried multiple video cards and all show the same problem. The monitor doesn't show loss of connectivity I just get a blank screen.
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More about asus p7p55 video post
  1. Ignore me, monitor didn't want to work with this combo for whatever reason, replaced monitor and worked.
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