black screen monitor

manhands

Geek Trainee
Hi,
I've just built a new pc and am now having trouble with one of the monitors. I have 2 monitors, one of which has its orange light turn blue on startup, but the screen stays black, then it goes back to orange again.

Old pc (single hd4890)
Monitor1 - ok
Monitor2 - ok

new pc (dual gtx470)
Monitor1 in top card - black screen
Monitor2 in bottom card ok

new pc (dual gtx470)
Monitor1 in bottom card - black screen
Monitor2 in top card ok

new pc (dual gtx470)
Monitor2 in top card ok

new pc (dual gtx470)
Monitor2 in bottom card ok

new pc (dual gtx470)
Monitor1 in top card - black screen

new pc (dual gtx470)
Monitor1 in bottom card - black screen

When I transition monitor one from the old pc to the new one, it displays correctly for a second or 2, flashes a few times and then goes black. I have an 850w psu so power shouldn't be a problem.

Any ideas would be much appreciated.
 
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