This is the saga of the upgrade. My old computer was doing some strange things. Making weird sounds and operating very slowly. I thought is was the CPU. I bought a new PIII 933Mhz/133Mhz bus. I went to install and found that it wouldn't work with my current Atrend board which has 100Mhz bus. I bought a new Asus P3C-E. This takes RDRAM, I had SDRAM, but I got a riser card to use my current SDRAM. I installed the new CPU and MB. Plugged in the power and nothing. I called a support at Asus. They said remove the board make sure it is not grounded and try it again. When I tried it again it started, but I didn't have the monitor hooked up so I tried to shutdown the unit. It wouldn't shut down so I unplugged the power cord. I hooked up the monitor and nothing. It wouldn't restart. I called Asus. They said I needed to get rid of the DIMM riser, go to RDRAM and replace my power supply which is 250 WATTS with at least 300. I replaced the RDRAM, but not the power supply. Put the board back into the case and tried to restart. Nothing again. I moved the board and the unit started. The bios came up and it was clocking nicely until I got to where it asked for the system disc. I couldn't open the disc tray. I pulled the DVD cable from EDI connector to check it. I then checked some other leads and the various cards. Noticing the lead from the DVD and thinking that it was a lead for the monster sound card I tried to plug it to the MX connection. That was the end The unit shut down and I can't restart even with the old board and old CPU. I get no power except when I went to pull out the ATX lead. I heard either the front fan or the HD cycling. Did I kill the HD, the power supply or what? The fuse in the power supply is good. As they say stupid is as stupid does.