External Display won't work in clamshell mode

Hi - I can't get my external display to work with the MacBook in clamshell mode - It works fine with the lid open.
I'm using it with the apple bluetooth keyboard and mouse.
I've obviously changed a setting without realising - can anyone help.
Thank You.
Ash
MacBook Pro (15-inch, Mid 2010)
Mac OS X 10.6.8

Sorry - I've now got it to work.
I don't know how - I just went through all the settings one by one, switched them off and back on again and it now works - I have to assume it is 'user error' but I can't work out which bit

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