GA-Z77X-UD5H Restarts instead of Shutdown with New Monitor

scussons

Honorable
Nov 20, 2013
16
0
10,510
I have a Gigabyte GA-Z77X-UD5H and Windows 8 64 bit. The PC has been shutting down fine with an old monitor connected via VGA to a R9 280X GPU. I've now installed a new Viewsonic VP2770 monitor via DVI. When I shut down, the PC now restarts instead. Is there a BIOS setting or Windows 8 setting to ensure the PC shuts down correctly?
 
When I select Shutdown, Windows closes down, the Gigabyte BIOS screen flashes on as in normal power on and the Windows log on screen appears. About 40% of the time the PC shuts down correctly.