My server, which I built with some spare computer parts, does not power off after when I shut down from the OS. When I try to shut down, Windows closes all programs and goes through the shutdown routine as normal, and the screen turns off, but the fans continue to run until I hold down the power button on the case.
More importantly, though, because of this problem, the computer cannot truly restart. Windows shuts down, it goes into the not-quite-off state, and it stays there.
For a while, the power supply in the server only had a 20-pin connector (the motherboard has a 24-pin connector), and I thought that was the problem, but I have since replaced the power supply with one with a 24-pin connector, but nothing changed.
Sites on the Internet seemed to recommend trying a clean boot, which did not fix the problem.
I thought it was a hardware issue, but the fact that I can shut the power down completely with the case's power button seems to indicate that it might be a software issue.
EDIT: It is a software/configuration issue. I booted off a Ubuntu Live USB and was able to shut down and restart normally without any of the issues Windows has. I'd rather not reinstall Windows if that is an option.
EDIT 2: It restarts and shuts down properly from safe mode, but I have not been able to get it to shut down properly from a normal boot, regardless of how many startup items I disable. I tried removing the video card and a Wi-Fi card that never worked, but they also had no effect.
