I'm pretty sure my PSU is dead, but I just wanted to check with people who have more expertise before I go buy a new one (I'm a software guy). My PSU is an XFX 750B; I've had it for maybe 8 months. Over the past 2-3 months, if my case was standing upright it, it would randomly shut off. I could only get it to post, boot etc. if I laid it on its side (which is exactly what I did). Last night (on its side) it shut off entirely and still will not turn back on. So, I've been using a multimeter to diagnose the problem. My power cord in has the appropriate ~115V before it gets to the power supply. Having the power supply switched on and plugged in, I then went to the 24 pin ATX connector. With the black prong on a ground, I checked every other pin. All of them were 0V except for the green PS_ON (3V) and the purple VSB (5V). My motherboard has a green and orange light on when it's all hooked up, and occasionally the fans will twitch if I hit the power button (usually not though). My thoughts are that my mobo is probably fine, but my PSU is dead. Does this conclusion make sense? Is there anything else I should try before buying new hardware?