Maximus VII Impact: won't turn off after shutdown

[marmup]

I have had this problem for over a week now. When I shutdown Windows 8.1 after running for more than 20 minutes, the monitor light goes amber and the screen blank, but my computer is still running. I have to manually shutdown the computer. When I restart it, if I shutdown immediately, everything will turn off normally. But if it has been running for more than 20 minutes, it won't shutdown. Any thoughts on solutions would be appreciated.

[blade-runner]

Have you sorted this? I have seen this before...

Create/modify the following Registry key:

System Key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
Value Name: PowerdownAfterShutdown
Data Type: REG_SZ (String Value)
Value Data: (0 = default, 1 = power down)

Setting the value to 1 fixed the issue for me... (Changes to Registry at own risk, etc)...