How do I get a video signal to an external monitor via the mini-display port on my Mac Book Air?

I can't get a video signal out through my mini-display port on my Mac Book Air (version 1).  Thus I can't feed BBC iPlayer to an external monitor.  There is some connectivity - the MAC wallpaper is broadcast, the mouse pointer is visible and sound is transferred.  Is it likely to be a cable connection problem (though the cable works with a Windows operating laptop)?

First, what you said is contradictory. You say "can't get a video signal", then say"the Mac wallpaper is broadcast, the mouse pointer is visible". "No video signal" means an absolutely black,blank screen. It sounds like you have plenty of signal.
I am supposing what you are seeing is actually a blank desktop, which is to be expected if your settings are such that you are extending the desktop, instead of mirroring it.
Within the preference panes is a setting that allows you to change this. Open System Preferences, click Displays, and then click Arrangement. You will see that you are extending the desktop. Change that setting.

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