I am upgrading/building a new pc using ECS KM400-M2 Motherboard and XP 2800+ CPU. The pc can be started up however it would be shut down by itself randomly with in 1 second to 10 minutes. A posting below metioned a similar problem but I can't figure out any solutions from the responses, which suggested that the reason could be something with the power unit. My questions are: 1. I am using an ATX case. Is that a problem? because there is not a case fan on it? 2. The cpu frequency is set to 133M Hz, should I change it? 3. Should I do anything to the memory? I just plug the memory into the slot. The memory is DDR 333Mhz. 4. Any other ideas? pls pls help! Happy New Year!