power supply is not the issue with 1000w, both power pins connected, update to latest bio. Power up and black screen.
Did you fix that issue with GPU and black screen? I also have problems with p8p67-m and Powercolor R9 270X. Same black screen. Updated bios etc. It's just frezes every time drivers are installed, with no drivers no problems, but as soon as i install them nothing works any more???