Sometimes Windows sees a second monitor connected but I only have one.
The motherboard is: GRYPHON Z97 ARMOR EDITION
CPU Installed: Intel Core i7 4790S (Intel HD Graphics 4600)
Intel HD Graphics driver version: 15.36.14.4080 (latest)
Windows version: 8.1 Pro 64-bit.
My "monitor" is an LG TV.
I can't really say how to reproduce since I don't always see this.
When it happens I have a "Viritual monitor" under "Display settings" for Intel HD Graphics settings.
Below is three screenshots of settings when is happens. Sorry but they are in Swedish.
The last one (from Intel HD Graphics Setings), shows it is a Intel WiDi display( whats that?)
Now sure but it seems to happen when Windows turn of Display (energy saving mode) and TV is on but showing TV not the cumputer screen.
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