Windows 7 will not reboot or shut down

I installed 3 identical HP PC's with Windows 7 Pro in a business. There are only a few programs installed, the same ones on all PC's there. One of the new machines will not reboot or shut down completely after logon unless the power button is depressed. It will function normally if you shut down or reboot before logging in. There is no domain, just a peer-to-peer network on the same workgroup. I installed default settings in BIOS. I checked for corrupt drivers. Keyboard & mouse are PS2. Monitor uses on board VGA. Nothing else is plugged in besides the LAN. Results are the same for std or admin users.
Albatross1953Asked:
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tankergoblinCommented:
try shutdown with command prompt

To shutdown your PC type : shutdown / s
To restart your PC type : shutdown / r
To logoff your PC type : shutdown / l

This happen since when?
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tankergoblinCommented:
or you can create a batch file by

create a shortcut. when wizard ask you to select a location you can create each for the following:

To shutdown
shutdown.exe /s /t 00

To restart
shutdown.exe /r /t 00

To hibernate
shutdown.exe /h

then click next. for the name just type shutdown, restart, or hibernate.
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Albatross1953Author Commented:
It gave the same results in command prompt. Once you log on, it won't shut down or reboot even if you log off before clicking reboot. The system fan continues to run. I also ran System Restore to a point before they installed their programs. It gave the same results except that a few HP programs didn't reinstall.
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McKnifeCommented:
If you log on, autostart items are processed. Those programs that start automatically might be the problem. Please use msconfig and disable all startup programs that you see for a test and restart and see.
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Albatross1953Author Commented:
I should have already done that. Here' s a new twist. I brought it back to my shop & it works fine on my monitor. I have an older monitor on my test bench. They have a large new monitor at the business. I did check that it was on 60Hz refresh rate.
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McKnifeCommented:
Really? Then try to reproduce it again to be sure. I have seen weird things, but this? Or is it connected to a KVM switch? Those have produced really stunning effects from time to time :)
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Albatross1953Author Commented:
No KVM switch. I just installed another video driver. I'll take it back to the business tomorrow to test it.
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nobusCommented:
some options to test out :
try with another PS (switch from a working one)
swap ram
switch the disk from a working with this one
switch parts
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McKnifeCommented:
Did my solution even help you?
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Albatross1953Author Commented:
The video driver said it was the latest when I did an update from Device Manager, but installing a different one fixed the problem.
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McKnifeCommented:
Ok, then you should have selected your own answer, not mine... :)
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