I'm running into a really annoying issue after upgrading from Windows 7 to Windows 8.

I first noticed it during the initial (clean) install; when the installer tried to reboot, my machine (an acer aspire 4755G) just hung after the initial shutdown. That is, after the screen turns off, the power lights and fans are still running, and the machine itself doesn't restart. (I let it sit for a good 15 minutes, and it still didn't change)

I managed to do a hard reset (power button for 5 seconds) and the install finished, but every shutdown/restart has been like that. Interestingly enough, hibernate works just fine.

I've looked at other solutions where it said to use the

bcdedit /set disabledynamictick yes

and that didn't work. I also turned off the "Fast Boot" option in the power settings menu. That didn't work either.

So far, the only option is to do the hard shut down by holding down the power button, but that proves to be horribly inconvenient.

Any ideas on what's going on here?