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HP AP5000 Freezes At Windows 7 "Starting Windows" Screen.

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.

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All Answers

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Re: freezes

In reply to: HP AP5000 Freezes At Windows 7 "Starting Windows" Screen.

How exactly do you mean "Tried both 32 Bit and 64 Bit Windows 7 Versions"? To install those on a hard disk they need a restart, so it seems that they won't even install succesfully.

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Not a normal PC is it?

In reply to: HP AP5000 Freezes At Windows 7 "Starting Windows" Screen.

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