I recently purchased a new motherboard, CPU and RAM and am trying to put it together with some spare old parts that I have lying around. The problem I am having is that it seems to restart itself as soon as it starts loading Windows. Strangely, it has successfully booted into Windows once out of 50+ attempts, and it ran fine for a few hours until the next time I switched it off and on again. The parts I am using are as follows: - MSI 770-C45 motherboard - AMD Phenom II X2 550 Black Edition processor - 2 x 1GB Corsair XMS3 DDR3 1333 DHX memory - Leadtek WinFast PX7800GT 256MB PCI-E graphics card - Jeantech PUFP-405 405W ATX PSU - Seagate U Series 5 20GB IDE hard drive (with Windows XP on) =P So far I have tested the HDD, PSU and graphics card on my other PC, and they are all working fine. I have also tried another PSU (also 400W) and HDD (500GB SATA with Vista) on this new build, and still getting the same problem. I have also tried using both sticks of memory individually. Not sure where to go from here. I haven't really played with the BIOS settings at all. I have restored the defaults and thats about it. Any help or advice would be greatly appreciated!