I changed my processor(from an athlon 1.2 to an unlocked 1.0, this involved removing and reseating my ELSA GLADIAC GeForce 2 MX (AGP) and removing and reseating the memory (2 x 256mb pc133 SDR SDRAM - from Crucial). I also had to take out the PSU (I only removed the ATX Power Suppy Cables - THE PSU is 300W). THe machine powered up (power went to the motherboard and I could hear the fan and all motherboard and front panel lights lit and think i can hear the HDDs starting) but did not boot and no signal to the monitor. Then put old athlon back in and still didn't boot. I have tested the memory and its fine, have tested spare memory in the machine to no avail. Any Suggestions?