Asus P5Q Pro Turbo No screen problem

Ok fist of all I must admit i probably have been a little too noob or too hurried about getting it done
that I installed OS before I did the motherboard setup.

I open the system and everythings worked well, I waited and the system runned and asked me to setup a 32 bit instal.
I did put windows 7 RC and runned it.

After like 20 mins it bugged and i had to close and restart the system.
I tried to instal windows but it didn't started.
In the bios i changed the boot up priority to cd drive and restarted the system.
I successfully installed windows and it worked with few lags.
I restarted the computer at windows demand and then when the computer start I don't have any screen.

Cpu intel Q9550
Mobo Asus p5q pro turbo
gpu sapphire ati radeon 4770
ram 8gb ocz
psu ultra 750w
hard drive western digital 1tb