I have the same issue as Faestaris. And nothing help's.
My dual monitor is black after updatet to 8.1.
I has tryed to deinstall and install the amd driver software or under safe mode deinstall the windows default driver. Really nothing happens.
I think the problem is Windows and not the graphic driver. Because a other BenQ Monitor is also black when i plugged via DVI.
Here some infos about my system:
-- OS
Windows 8.1 Pro (since last week updated)
-- Graphic Card
AMD Radeon HD 7900 (lastest AMD 13.11 Beta 9.4 installed)
The new graphics driver of amd are ready to download under
http://support.amd.com/en-us/kb-articles/Pages/latest-catalyst-windows-beta.aspx but it's not solved my "black screen problem".
-- Monitors
22" Samsung Syncmaster 2233BW (primary)
19" BenQ FP937s (second)
The actual state that the 19" monitor get signal (the led near the powerbutton lighs green) but the whole display is black.
Both monitors are plugged by DVI cables. With VGA cable is'nt possible to detect the 2nd monitor.
Under Device-Manager is the second monitor called "PnP-Monitor Standard" and in the resolution manager of windows they called by name "BenQ FP937s" also in Catalyst Control Center.
If i reanimate my monitor. BenQ logo shows - fade out - desktop appear (low brightness but seeing task and background-image) and after 2 seconds its complete black.
Has someone the same problem and has a solution?
offical amd forum post:
http://forums.amd.com/game/messageview.cfm?catid=454&threadid=169703&enterthread=y