External Apple Monitor causes slow down
I have a MacBook Pro Intel Core 2 Duo 2,53 GHz Cache:6 MB Memory:4 GB Bus Speed:1,07 GHz.
I am using a trial version of Parallels Desktop 5. I have Windows 7 installed on the Virtual Machine. It works fine until I plug in my external Apple Monitor. It connects via 3 plugs-- a charger, a screen plug and a USB connecter. Once I have connected the two together my MacBook slows down to a crawl and all Apps become frustratingly slow. Can anyone help with providing me with the correct settings to use so that this does not happen?