Tried both ports of the 260,still nuthin,I would boot in safe mode but......I can't see anything,screen is just black,nothing appears at all

The PSU is a 1000watt I-cute model and running fine

Ive reinstalled my GTX8800 and everything is running fine again

Im wondering if the 260 is duff
The drivers were the correct ones,just released from Nvidia
the display is set at native 1680x1050 60Hz for my Samsung Syncmaster 22in
Im at a loss as to why its not working,unless its knackered