I just upgraded my PSU and Motherboard to accommodate a 760 SLI, and got a MSI z97s SLI Krait and an EVGA Supernova NEx 750B, however when all parts were plugged in, the computer did not boot. I thought it was a problem with wiring, but I triple-checked to make sure everything was plugged in correctly, and it still didn't work. I tried booting up the computer with the old PSU by connecting only the MoBo and the 8-pin, and it was able to boot up. I don't understand my problem.