I just recently upgraded from a Dual Core AMD system to a Quad core AMD system. Same tower and power supply. For some reason now when I plug in USB devices, the system randomly freezes. Also, randomly, the system doesn't want to power up correctly. I have to hit the power button rapidly, almost like I'm priming the power supply to give enough power to keep the system going. I'm listing my specs below. Any ideas would be helpful. Thanks. Antec Solo Tower w/ Antec Smart Power 500W power supply ASUS M489GTD PRO/USB3 Motherboard AMD Phenom II 955 Processor (3.2GHz per core/Quad) 2 2GB sticks of Corsair XMS3 DDR3 Ram (running at 1333MHz) ATI TV Wonder 650 TV Capture Card 5 USB devices always plugged in (Wireless KB & Mouse, MS Lifecam 3000, Receiver for remote for Media Center, and two printers) 1 LG Blu-Ray Drive/ DVD R/RW/ CD R/RW 1 Sata II 5400 RPM 500GB Drive Sound and network are running off of built on nic and sound card on the Motherboard.