My friend bought a computer from someone and it was running 2 psu's. 1 was a stock 350 watt that came with the case(crap psu) and the other was a 5 1/2? Drive bay psu 450 watts. He wanted to swap them for just 1 psu, because the drive bay was making a lot of noise (worried it was about to die) so I ordered him a corsair cx600 from newegg and a 1tb hdd. I installed it and the computer wouldnt boot up. I noticed his mobo has a 6pin gpu connector so I reinstalled the drive bay psu and just plugged that in, it finally boot up, but then I ran into a boot loop. Windows logo would come up run for about 10 sec or so then the computer would restart. I tried unplugging the new hdd, that caused the computer to not boot at all. Safe mode will start up with everything plugged in but I really couldnt find anything to help me from safe mode. His mobo is a msi 990fxa gd65 gpu is evga nivida gtx 560.