I recently bought a Asus P5Q mainboard and a Gigabyte Radeon HD 4550graphic card. After installing windows everything boots up correct, but after installing the graphic card drivers from ATI’s homepage something goes bad. The system can no longer boot up, it comes to the windows intro screen but it never makes it to the login screen, I just get black screen. Have tried all the outputs on the card black screen on all of them.
Is it possible you accidentally installed the wrong drivers?
Safe mode works perfectly and i have uninstalled the drivers, i have tried both the drivers that comes with the graphic card cd and the newest from ATI's homepage. The power supply is 500w so should be enough.
I should also mention that i sent the card graphic card back and got a new one, this have the same problem, so i think it might be the mainboard?