I have removed all cards and drives. I have disconnected the side case fan. The only things connected are the power cable to the power supply, two connections from power supply to motherboard. Without memory, nothing happens at all. With PC2100 memory the fan starts up and abruptly shuts down in a matter of seconds. (2 or 3 tops) With PC2700 memory the fan stays running and the system just beeps like 5 times. This leads me be believe that the 2100 memory (which was what was in the system is the correct memory, but that there is something wrong with it. Am I on the right track?