I bought a refurbed a1330n HP and upgraded the video to the GeForce 6 series and also upgraded to a T.Take 500w PS. One day I see my PC sitting at the HP Invent post screen. I have since then taken out the upgrades and tried to reboot... same problem. So I take to it back to Fry's and it boots with no problem. It has done this 3 times already, the problem is when I get home and connect it back up, I get the post screen problem again. What gives?