Mac only works with 2 monitors connected

My mac pro OSX 10.7.5 briefly had a second monitor connected via a dvi to mini adaptor. My main screen is connected via dvi. I now want to remove the second monitor but when I do, my main screen remains black; it only works if both monitors are connected. I have tried rebooting, switching display ports, rebooting with no displays, the rebooting again, switching mirroring on and off, but nothing seems to work. The second monitor does not even need a power source - it seems that the graphics card (ATI Radeon HD 5770 1024 MB) is stuck in dual display mode. I have also removed the com.apple.windowserver.plist from preferences, but no joy. Any ideas?
Cheers,
Mark.

My guess is your setup is wrong. On my 5.1 system, I get sound from all the speakers, including the rear ones.
Open the Quicktime control panel, and click the Audio tab. Make sure the "Channels" pulldown matches your current speaker setup.
Also, in the "Sounds and Audio Devices" control panel, on the "Volume" tab, click the "Advanced" button under "Speaker Settings". Make sure the Speaker setup pulldown matches your current speaker setup.

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