Bought a used mobo/chipset/RAM back in Nov., had a bugger of a time getting it running. Finally formatted the hd and got it up. Unfortunately since it's used I don't have all the documentation but I know it's an Asus AMD Athlon supposed to run at 1.33. The previous owner had it at 1.5 and says it should work together fine. Getting into the BIOS there's an option to switch to the 1.33 ghz, but if I select that, the computer won't boot; it just hangs with a blank monitor. So I reboot and swap it back to 1 ghz in the BIOS and then it boots up fine. There's no error message and we checked the jumper settings, so we're not sure what the problem could be or how to fix it. Tried swapping out the power supply (235 to 300W) (ATX)..was told this should be more than ample and that power wasn't the problem. Have 2 Maxtor HDs, 10x DVDRom and am running WinXP Pro mobo/chipset came with ATI AIW 32mb 4x AGP video card but upgraded to an nVidia GeForce 5500 8x AGP (although mobo is only 4x). Couldn't get it up to 1.33 with either. Any ideas what the conflict could be or what to try would be appreciated. Was told it had to be a hardware conflict or a BIOS setting but I haven't a clue where to look. Thanks!