I would go to the shuttle website, and check to see what is the latest bios version for the board. Then reboot, and the bios number will be displayed at the top of the screen. If yours if different, I would download it from the shuttle website, and save in documents file. Click on the award icon, and 4 or 5 files will be created. Then click on the awdflash icon, and wait 30-45 seconds for the file to load (dont'do or touch anything while it's loading). When it's finished, a white rectangle will appear on the screen, saying the file has been loaded. Reboot into the bios, save and exit. Then reboot again, and check your bios settings. I don't have a copy of mine in front of me ( I switched to a different mobo to run the p4 1.6a), so it's a little hard to remember all the settings. In the "frequency control/voltage" section, try changing the cpu clock to 138. Then check the settings in the "advanced chipset features". Under "advanced dram control", change to "manual", enable "4 bank interleaving", "agp fast writes", and try running at "case"= 2, instead of 2.5. You will have to experiment with the settings, and see what works best with your cpu and memory. Good luck.