PowerColor HD 6850 no signal


Aug 15, 2011
Hi I have just finished a new build which is working fine apart from the powercolor scs3 HD 6850. Whenever I plug it in my monitor reads no signal but the system still turns on. I can hear that windows is working as usual. When I take out the card then the whole system runs fine on the MB's onboard graphics. I have updated 6850's drivers as well as dell monitor's, MB's and everything else I can think of. Any suggestions how to get it working?

Intel i7 2600k
Asus P8Z68-V PRO
PowerColor HD 6850 SCS3 1GB
Corsair 120GB SSD
Antec CP-850 PSU
Dell U2412M monitor