I had an hp envy h8-1414 and upgraded the power supply (750w) and GPU to gtx260, which was a left over card I had. ALL WAS WELL! Until I realized that card wasn't able to meet my needs, so I move the motherboard/processor (m3970am/ FX6120) into a new case with same ram (original), power supply (750w) and upgraded the gpu to gtx650. I forgot to plug in the power to the gpu and the motherboard yelled at me, so I realized what I did and plug it in (after turning the computer off). Now everything turns on except the gpu, any ideas?