As the title says, I've plugged in an AOC external monitor to my laptop using the hdmi port, and now it displays a partially transparent white box on the upper left corner. I've:
-turned both on and off again
- swapped hdmi cables
-changed to different port on the monitor

Has anybody had anything similar to this or seen it anywhere?
The laptop is running windows 7 64 bit, using an nvidia chipset.

Thanks in advance.
Simon 
 
Ps had a search through google and no help there either. :-(