This is driving me crazy! I decided to upgrade my PC. I installed a combo consisting of Athlon 300+ and Abit MB NF8-v2, with PC3200 memory. At first it would not start. The fans would jerk when power was applied and the red LED on MB would light. Sometimes the fans would turn briefly (less than 1/2 second) when the power button was pressed. I tried replacing the PSU, the memory, the MB, and finally the CPU replacing the white thermal goo with Artic Silver. When I replaced the CPU the PC worked for a day, but when I shut it down to replace a case fan with a quieter one, the condition returned! It won't start, only the fans jerk when power is applied! What is going on here, please?!