I got a second 560ti yesterday for sli and when I had it plugged my PC wouldn't turn on. So I took the new 560ti out and tried to get it to turn on but nothing would turn on. I checked all the chords to make sure they were plugged. I turn it on again but ut froze within five minutes. Now I can't get anything to boot, all that happens when I turn on the PC is spin the fans. The debug led thing doesn't even turn on. I have tested every slot of ram, I tried resetting the motherboard. Can someone tell me what else I should try. I think it's either the motherboard or power supply. Can someone please help me with what I should test to see what's wrong? thank you