HP AP5000 All In 1 POS System Freezes At Windows 7 "Starting Windows" Screen. Logo Doesn't Even Show. Bios works and I can reach the F8 Windows Boot Options. All options freeze at the "Starting Windows" Screen. The screen freezes and goes blank if I try to choose "Launch Start Up Repair". Safe mode freezes once it reaches "CLASSPNP.SYS". Ive enabled and disabled all bios settings. Ive tried several dual core CPUs and a Celeron 400 CPU. Ive tried different DDR2 RAM. Ive tested the RAM using both short and extended tests and it passed. Ive tried 2 hard drives and they work in other computers fine. No Bluescreen message appears. Used a USB to load HP vision diagnostics, the ram test it passes. Tried both 32 Bit and 64 Bit Windows 7 Versions. The Fan revs gradually higher when frozen on the WIndows Startup screen. Tried with and without Keyboard, Mouse, MSR and VFD Screen connected. Any help would be greatly appreciated.