To: Raymond Duray who wrote (13385 ) 6/17/2002 10:08:17 PM From: Robert Graham Read Replies (2) | Respond to of 14778 How about this problem? When I run CPU Stability, the end result is an application popup message in the event file of WInXP that states there has been a machine check. Due to this and other symptoms, I suspect information on the disk was corrupted. CPU Stability program exersizes hard drives, memory, and CPU, and does a good and efficient job. And the software is free. Once I have verified to the best of my ability it is not software, I then started testing for hardware. I have removed everything except the hard drive. I have WinXP as a fresh install with only the critical updates applied. The other hard drive and both CD drives (CD-R/RW and DVD-ROM) have been removed. I determined it is not the network card, and the memory. I removed the network card to end up with the same problem. I swapped the memory stick and set the BIOS to default setting, just to have the same problem. I have replaced the power supply with a high quality product. And I pulled the computer off of its UPS. I also have the same problem when I replace the video card with one that is PCI instead of AGP. I also have the video card running without its driver, which means the AGP part is not enabled. What is left is the motherboard, the version of the BIOS the MB is using, the hard drive, and Windows XP itself. I have performed allot of research to find no one having problems with WinXP and this motherboard. Also the MB is a good make that has been out for over a half of a year. So in my current configuration, if I still end up with this problem, then I will need to test the hard drive and look for bad sectors. Also I may upgrade to the latest version of BIOS. Now if the problem has disappeared, this will be a puzzle. For I have just removed the DVD drive which leaves no CD type of drives installed on the system. This means both the CD-R/RW and DVD drives cause problems. In this situation, I do would not think of either drive being the problem. So the problem is with the cable or the IDE interface on the motherboard. What is even more interesting is during the CPU Stability tests, the CD drive is not being used. So the drive would not be accessing the bus through the IDE interface. It can be a static electrical problem, like a drive asserting improper voltages through the cable. But I do not believe this to be the case with BOTH drives. So this would point to the IDE interface on the motherboard as the problem. Any thoughts? Bob Graham