I got done playing some GTAV and was talking to my friends on steam when my PC turned itself off unexpectedly. I initially thought a mains switch had flipped and thats why it went off as its happened once before. Couldn't get PC to turn on after that, started breadboarding, removed all ram and my GTX970 until all that remained was PSU (EVGA GS550 Gold standard) and Mobo (Asus H81M-PLUS). PC would turn on for a split second and then turn off. Nothing worked so I went to my friends house and borrowed his old Dell PSU. Plugged it in to mobo and cpu socket and the fans fired up immediately and stayed on but the motherboard didnt give me any "No ram" beeps. Is it safe to assume that the EVGA PSU fried my system? what are the chances that the mobo/ cpu/ gpu/ ram are dead?