Hello, At the end of April we had one of our systems go down because of a MB failure. After working with the vendor they did not have any more of those particular systems available since it was EOL. They ended up supplying us with a demo unit they had sitting on the shelf that they said was tested and worked well We started getting BSOD errors for various reasons starting shortly after we replaced the system. Here's what we've done so far: - Updated all firmware for MB and PCI cards - updated all drivers from manufacturer and vendor - replaced the memory - installed known good HDD with fresh install of Windows XP w/SP3 - tested the system without the PCI card to eliminate that as a cause We've run CHKDSK /r and SFC to verify the HDD and Windows system files. Also have run MemTest86+ for at least 10 passes with each test being passed. We suspect it may be the motherboard on this demo system as well causing the trouble again but we were hoping for any suggestions for our next step or additional steps to confirm the motherboard. MB: SuperMicro X7DBE-X Memory: 4 x 1GB Crucial 240-PIN 128Mx72 DDR2 PC2-5300 Fully Buffered attached are the minidumps from the last 2 days.