I currently have a Duron 800 on an Asus A7V133 (BIOS 1007). Last week I ordered a new Athlon XP 1600+ and Global WIN WBK38 cooler to replace my Duron. I also bought a new Antec 400W (PP-403X) power supply because my old PP-303X (not even a year old) didn't meet the required specs. Today when I tried to boot-up with the new parts installed, there was no beep and no video. Afterwards, I pulled out the new chip, put my old Duron / Cooler combination back in, and I was able to boot-up with no problem. I know my board and BIOS are supposed to support this chip, and I was VERY carefull installing the new CPU and cooler. I am assuming the the CPU is bad, and I am planning to send it back. My question is, is there anything else I should try? I've tried forcing board to 133MHz with the jumpers, but that didn't help. Is it possible that it could be my mainboard or memory? I have 1 256M PC133 DIMM (PNY I think), and no others to test with. I guess I could try forcing the board to 100MHz, but if it worked, what would that tell me?