1
vote
1answer
694 views

Macbook Pro with External Monitor Keeps Readjustng

I have a mid-2007 Macbook Pro running OS X Lion which I connect to a Dell external monitor via the DVI port. Recently, the screen has been constantly turning blue (which seems to indicate that it is ...
3
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5answers
19k views

MacBook Pro doesn't detect external display after Lion upgrade

Asking on behalf of a friend. His 2011 MacBook Pro (no Thunderbolt) was running Snow Leopard and was being connected to a Dell monitor in the standard way. He upgraded to Lion and now the MacBook ...