I have a custom build pc is a bit old it had changed psu and case, in the present it has a a 550w psu, 6gb of ddr3 ram,1gb 5450 radeon hd ddr3,dual pentium wolfdale 6600 oc, kc300 ssd, and a 750gb seagate hardisk, sudenly the computer struggles to post, and when it does some green stripes appear for a second on bios logo and then never appear again until i struggle to turn it on again. I have to power off/on unitl it shows video. Help i cant afford buying another Pc!! Maybe it is the gpu, until i took it out and it didnt post still, I dont know guys im pretty good fixing computers but i dont have a clue here, please I beg for help! Oh and i got an G41D3C Mobo.