So my Antec 430w ATX psu blew out this afternoon. I guess it was overdue, it was over 4 years old and I have a pretty dusty office, so it wasn't unexpected. I bought the Dynex 520w PSU from bestbuy. Popped it in. At first, all seemed well. Worked okay. Not terribly happy with the PSU as it doesn't have a power switch on it, but I can live with it. I have a very basic setup, ATI Radeon 4600 graphics card, quad core 2.4 intel, 4 gb standard RAM, dual tuner TV card & all the boring shit that goes with any TV. Anyway, fast forward about 2 hours. Suddenly my PC is randomly shutting down without warning. Reboot, barely gets to the desktop & shits the bed again, turns off. I disconnected the TV card, my firewire card, and an extra case fan I was running, and as of now, it's up. It's preforming well at this moment, but I have no idea how long this is going to last. Question: Why would a Dynex 520w shit the bed where I was running just fine with a 430w Antec for years?