Pc doesnt shut down

try disable the auto updater...if you windows isn't genuine. (btw, my definition of a "genuine" windows is a product developed by MS and not some fake copy that just looks like it)
that's why the updater might be stuck. (some updates are being installed while the computer is shutting down)

i really hope, that this does not resolve your issue, capt'n greedy.

Since it's "not genuine" I'd say that is part of your problem. With Windows 8 being so cheap when it was released I don't see why anyone would run pirated copies.

Right after closing this tab, I was going to go AFK and I unconsciously shutted down my PC. Thanks brain.

Something might be wrong with your HDD, either scan it for malicious software or defrag it.

are you using windows 8?

Look at your task manager before / during the shut down process. Look for something hanging around that it might not be able to close automatically (like lingering, unfinished installers or updates in progress).

I hate it when you unplug your PC, and it stays on.

have you try restarting your computer yet?

Have you tried removing the cat from the printer?

I have a weird variation on this problem, lol.

Windows shuts down and all but my PC doesn't turn off... if you understand what I'm trying to say. I opened it up and checked the PSU and mobo cables but they're all plugged in right.

And I have genuine Win7.

Have you tried throwing your PC out the window?

Have you tried violence?

I dont know if anyone has mentioned this, but you really dont need to unplug your PC, and you really shouldn't, it can do damage. Just hold down the power button for a few seconds and it will do a "hard reset". If that doesn't work, theres a switch on the back of the PC, near the power cable, flick that to turn off the power.

As for your issue, the first step would be to check if you have any viruses or malware. Then use task manager to see what programs are running when you try to shut it down, something there might be preventing the shut down, although quite unlikely. You could always try a system restore too, to restore your PC to a previous date when everything was working.

Try this

Have you tried turning it off and on again?

save all important archives and restore your PC ;)

Reinstall.. otherwise
http://download.cnet.com/SuperFast-Shutdown/3000-2094_4-10410931.html
something like this..

Why do you want to shut down my zombie pc virus?

delete system32

That would be all the porn you download.

It definitely sounds like a PSU problem.

You should replace it.