My computer keeps shutting down whenever I try to watch videos or go to webinars, run antivirus scans, sometimes when I play games anything that use a lot of memory. I uninstalled a bunch of programs that I do not use hoping that this would help. This has been happening for quite some time but now it is getting worse. All of my fans are working and I have my case open for cooling and there is no dust inside. I bought my computer from CyberpowerPC here are the specs: Case X-Cruiser Mid Tower 420W Case W/ Window, Multimeter Display & Control CPU: (Socket AM@) AMD Athon 64 x 2 4600+ Dual Core CPU w/HyperTransport Technology Fan: CoolMaster Liquid CPU Cooling Fan System HDD: Single Hard Druive (250GB SATA-II 3.0Gb/s 8MB Cache 7200RPM HDD) HDD2: 250GB SATA-II 3.0Gb/s 8MB Cache 7200RPM HDD Motherboard: (Socket AM2) ASUS Crosshair nForce 590 SLI MCP Chipset DDR2/800 MBoard w/ Dual 16x Memory: req. DDR2 Mainboard) 2GB (2x1GB) PC6400 DDR2/800 Dual Channel Memory OS: Microsoft XP Professional w/ service pack 2 (I downloaded Service pack 3) Power Supply: NZXT PF-500 500 Watt Power Supply IEEE Card: IEEE 1394 Firewire PCI Card and driver Video: NVIDIA GeForce EVGA 7600 GS 512MB PCI-E x16 Can anyone help me this is driving me nuts. I bought this gaming computer thinking I would not have any problems and I have had nothing but problems with videos and games. I tried to get help from tech support at Cyberpower with no luck.