tulsamurph

Hello, I did not read every post here, but I was pulling my hair out trying to figure out a system with some of the same type of problems you are having. On my particular system, I got blue screen lock-ups after several minutes if I did not have the video driver installed in XP Pro. This is a new system, every part brand new. I had switched every single component except the CPU and still got the errors like IRQL_NOT_LESS_OR_EQUAL, PFN_LIST_CORRUPT or MEMORY_MANAGEMENT. Sometimes I got better results trying a slower clock speed, sometimes I did not. I talked to Microsoft, Soyo (Motherboard Mfg.), the memory manufacturer, pretty much everyone. Every BIOS setting I tried, every driver I downloaded, new ram, different ram, different DIMM slots, different video cards, different drivers, BIOS updates, different power supply, everything on the board disabled, all but the essentials unplugged or turned off in BIOS, all led to the same result, blue screen errors. In my case, the CPU temp was perfect. The Tech support people seemed to all come to the same conclusion: defective memory or motherboard or hardware of some type. I tried 6 different memory DIMMS, of two different brands. I tried two different motherboards (same make and model) and still got the same result. I got my new CPU, popped it in and all problems are solved. I now have a rock solid machine that handles large graphic files with no problems at all. Bad CPUs are rare, and often, heat is a good indicator, but in my case, it just did not work right. It is a P4 3.0g 800fsb, 512k cache. I hope this helps!