I thought I had fried my power supply, but upon connecting the replacement, the computer still won't turn on. I would be grateful beyond measure for any troubleshooting assistance anyone can provide. I have a multi-tester but no experience testing electrical connections. If given directions, though, I can do just about anything. I'm perfectly willing to send back my new power supply as D.O.A., but I'd rather be able to test it and be sure of that first. I'm worried that the problem may lie in my motherboard. Maybe I'll luck out and it will just be a bad switch ... ? My motherboard/p.s. connector's pins are as follows, if this helps at all: 1 - 3.3V 2 - 3.3V 3 - COM 4 - 5V 5 - COM 6 - 5V 7 - COM 8 - PW-OK 9 - 5VSB 10 - 12V 11 - 3.3V 12 - -12V 13 - COM 14 - PS-ON 15 - COM 16 - COM 17 - COM 18 - -5V 19 - 5V 20 - 5V According to the p.s. installation sheet, the on-off function of the p.s. is controlled through pins 13 and 14. Thanks in advance!