I have an AMD 1900, 1GB RAM, 80Gb HD, NEC 1300 DVD-RW. It has started misbehaving by turning off while in mid use. If I switch it back on again it works fine. I think the problem is related to the power supply or overheating. What can i do to monitor the temperature to see what the temp is when it powers down and what other suggestions does anyone have for how to stop this happening? Thanks