PC won't shutdown


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After install of Win7 to an old Gateway 700LTD, it won't shut down and just restarts when clicking Shut Down, Sleep, Hibernate or using the Power Button to shut down. I have to do a hard shutdown at the point where it restarts.

This is an older machine which could not boot from disk, so I pulled out HD and used another PC to install Win7, but drivers were easily adjusted when I reinstalled HD and it is working well, even the ancient 64mb NVIDIA MX400 video card took it's XP driver.

All BIOS settings are returned to default, I tried troubleshooting various fixes got from Google, then decided to determine if it is a Win7 issue by installing another copy of Win7 on a second test partition, which also won't shutdown. Don't you think this eliminates the OS settings as the culprit?

If it isn't the OS and BIOS is set to defaults, then I am thinking Power Supply or CMOS battery failure. Any other ideas?

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Update: Was just running my bootable HD diagnostics (checked out clean) and when I went to exit by hitting the power button, it turned off for the first time in two days. This seems to indicate that the problem is perhaps with the Windows environment and not a hardware or Bios issue which should also replicate in boot. Thinking it might be a driver now, I just started in Safe Mode to see if it might be the ancient video card driver or huge 2001 Soundblaster package, but it won't shut down from Safe Mode without those drivers anyway. Any help?

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