ANtec AR-350 Power supply, K99MV Motherboard. Problem started after I had some problems switching Wireless Network card. The computer runs for about 2-3 minutes and the Poff! screen black, Power led flashing slowly. I have stripped out everything except memory, started and gone into the bios and left it there just monitoring the board (voltage and fan speed). Same thing happens. My dilemma is to decide if it is the motherboard or the power supply. It is not memory, I have 2 banks and have tested one and one. I am currently in Gran Canaria, Las Palmas so its a bit difficult to find hardware. Any help on how to decide?