text: The mobo sounds like the place to start. But, first is the computer old?? It may be time for a new one! If your going to keep this one for awhile, check the CPU fan and make sure that it is running constantly. If the CPU gets too hot the computer no workie! CPU fans are a cheap fix. How about case fans? Do you have any? If not, install one or two. Hard drives and CPU's generate a lot of heat. If the computer gets too hot it shuts down! Your power source may not be big enough for the equiptment you're running. Make certain that your memory sticks are fully inserted into the dimm sockets.