built my computer over 4 years ago, woke up one day and my computer would only turn on for a couple seconds before shutting down. stripped it down to: MoBo: Soyo Dragon Plus 2 (ATX, 478 socket) PSU: 350w w/ X-dreamer case CPU: 2.6Ghz Intel P4 still had same problem. replaced PSU w/ 400w, same problem, replaced CPU w/ 2.4Ghz P4, same problem. thought it was a bad CPU because when start it up w/o the 4 pin connecter plugged into the motherboard, it runs the fans w/o powering down. what am i missing? appreciate your time.