Ive been helping a friend with his new computer and its been hell so far. Anyway we put a AMD 6970 into his new HP and we get 6 beeps and no post, so I looked it up and well it says a graphics error. I then thought it may be the card so I tried it in mine with no problem. We then tried a 7770 with same results and a 6670 and still the same thing. Now my guess is the port is shot but still this computer is literally brand new and yes we did change out the power supplies as well to support the connectors for the graphic cards. Also its a 750 watt so i know its not underpowered. Now is there maybe something im missing maybe in the bios or is it just a bad port. Also is can we change out the motherboard and not have to reinstall windows because I had a very similar problem where windows would not take to me changing the motherboard and processor.