Computer won't shut down or restart

Hey guys, I just build a new PC last night and installed Windows 8. When it was installing, there was no issues since it restarted okay on its okay. However, once I put in the driver disc for the motherboard and installed the drivers, the computer would stay on after I shut it down with the screen black and everything, and the OS wouldn't come back on after I restart it; it would stay black with the computer still running. Any ideas? The motherboard is a Gigabyte z77-ud5h so perhaps the disc wasn't up to date with a kill signal or something.