PC won't boot

mainboard: MS-6378 Ver 3
OS: Windows 2000 Advanced Server running McAfee ePolicy Orchestrator

BIOS was rev 3.1, flashed to 3.5, cleared CMOS, loaded setup defaults, PC gets to the white progress bar, then stops, it dosen't get to the Windows splash screen. I remember in the past I had the same problem, and simply imaging them with ZENworks imaging fixed it. The problem is, I can't simply re-image this as installing/configuring McAfee ePolicy Orchestrator is a large job. I tried rolling back to BIOS rev 3.2, didn't work. Any suggestions?