The O.S. is probably crashing at shutdown, and you have the option to reboot after a crash. That's the default. If you change that, and I recommend it, instead of rebooting, it will sit there showing you the blue screen of death. I'm guessing the video driver is bad.
To change the option, right click on "My computer". Click Properties > Advanced tab > Startup and Recovery Settings. Uncheck the box for Automatically restart.
Actually it's not blue screening. It goes through the normal shutdown process, "Saving Your Settings" then "Windows Is Shutting Down". The drivers are Nvidia's latest. It's just like you select "Restart" in the shut down menu instead of "Shutdown". Windows event wiewer is clean also. When logged on to Windows, the computer runs great and I can even watch Blue Ray movies with my Blue Ray drive so I'm not really thinking it is a driver issue or Windows issue. Something about this board or some setting in the BIOS or possibly the card itself is the culprit. I was hoping someone here had seen this problem before and would have a suggestion. By the way the OS is XP Pro.
So, Did you resolve your issue?
If so... please let me know how...
because i have totally same problem as u have.
my mb is d865gvhzl and the issue began after i added pci geforce 8400 gs and can't shutdown... it restarts always...
No, I haven't resolved this. I assume it is a compatability issue between the motherboard and the card. I have no idea.
Can you guys check what your power supply is? We are having the same problem, and PNY says I need at least a 300W Power Supply.
Power supply is a good place to start.
Some power supplys have issue with large current draws at shutdown causing the standy voltage to dip as the system is shutting down.
This dip is interpited by the mother board as an AC power failure and depending on how the BIOS is configures, the board powers-on after an AC failure.
If the board you have has options in BIOS to stay off after AC failure, it will likely stop the rebooting.
It turns out that the motherboard is not at fault here. The video card was the culprit. Reguardless of which computer it's installed it, it does the same thing. I've tried three computers, Dell, HP, and Emachines.
I had the same problem with a PCI 8400GS that I had purchased for a customers old Dell PC (865 chipset if IIRC) so that they could run a new widescreen monitor.
I tested this on a HP DX2000 MT, I tried a few different settings in the Power Management options but the olny one that actually resolved the issue was setting the 'Remsume on PME' to disabled, after that when you shutdown the PC it will not restart just shutdown as normal.
I hope this helps somebody.