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.