I have an emachine desktop computer using Windows XP. I leave it on 24/7 and it started shutting itself down about once a week, then once a day, then once and hour, then every two minutes. I was sure it was the power supply so I ordered the correct one online. I installed it but it still shut itself off. I did a Google search and found that emachines frequently have the motherboard go out at the same time the P/S goes. I found a motherboard on line with cpu for $170. but of course I would then have to buy an operating system which would then approch the cost of a new box. Anybody got any suggestions on how to save this PC.