what the title says.. I bought a HD Radeon 6670 2GB graphics card to go in my HP 500-023w PC.. when I placed it in it.. the fans all come on and I can tell its loading up... but the screen is just lifeless.. doesn;t say no signal or anything.. its just lifeless... I have read a few other post on this matter about the 500-023w but no answers were posted.... please help me if possible