I'm having problems with my custom built system. It is made up of a ASRock 4CoreDual-VSTa motherboard, Intel Pentium D CPU 2.80 GHz, WDC-WD10EZEX 1TB HD, WDC WD500GB HD, 250 GB SSD, NVDIA GeForce 8400GS video board, Vista-View Saber DA-1N1-PCI TV Tuner running Windows XP SP3. It started shutting off for no reason and sometimes not powering back up so I changed from a 600 watts power supply to a 800 watts power supply. I have 4 case fans plus the power supply fan and the cpu fan in it. The few times that it does stay powered up I have to select Windows debugging mode to get it to stay on (about 4 hours). When it is running I have run Ad-Aware Antivirus, Systems mechanics, Malwarebytes and CCleaner, but the problem remains. Anyone has any suggestions? I like this motherboard because it can run both IDE and SATA devices.