The model number is lpk12-35 it says 550w on it but when I plug my graphics card into it my computer wont turn on. This is a fresh build and my first build. The card is evga gtx760. Mobo is msi gaming 5. Cpu is i3-4360. I bought the psu off eBay and it is a knockoff brand. It also is lacking the 8 pin pcie so I got an adapter for it. Also I must note that I powered the computer on and used the card for about 5 minutes while I was trying to download drivers and the video froze and my computer would no longer boot with the graphics card in... please help