I just got the GTX 770 and I install it. I first thought that my CX500 might be able to power it after my research but it didn't. Nothing happen to the 770 and I got a black screen but the fans are still working. So I put my old gpu back and my PC start acting up. It seems like my psu isn't giving enough power like it use to and my LED light isn't turning on. Right now, I'm afraid that I may have fried the GTX 770 and I'm not sure if I should return the 770 or not?? I feel so stupid that I didn't buy the 700 watt power supply when I was at Bestbuy.