Whoa! My dad's PC was acting funny, not turning on, spontaneous reboots, etc.. Then it stopped turning on all together. He asked me to take a look, so I plugged it in and checked the PS on off switch in back, and pressed the power button on the PC. BANG! went a loud noise in the power supply and immediately a big puff of smoke came wafting out of the PS! I disconnected everything and took out the PS. I heard some rattling inside and shook out some bits of thin metal and what looks like the casing of a capacitor! WTF? This case / PS is only 4 years old. Has this ever happened to anyone?