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Windows 7 shuts off secondary display

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Since yesterday it's been doing that. I recall tweaking some Power Options in the Control Panel in order to let my computer run for longer before going to sleep. I had also set up a screensaver I disabled after.

Now my problem is, if I set up a multiple display on my CP and have it as ''duplicate these displays'', everything seems fine. When I go in full screen mode in a game or anything else, the secondary display gets shut off. I think it may be related to a power saving feature but I'm not sure. I reset the settings to their default value but no luck.

Motherboard: Gigabyte GA-Z77MX-D3H F15(latest stable release)
Intel core i5-3550 3.3GHZ (boost 3.7GHZ)
PowerColor HD Radeon 7950 CrossfireX 925MHZ Boost
Corsair HX850 850W Silver Plus
8GB DDR3 Corsair 1600MHZ

Display 1: Asus VH242H 23'' 1080p
Display 2: Panasonic Viera 50'' 1080p

It used to work perfectly even with the CrossfireX set up. Also, if I stay on Windowed mode, it works.

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