Proper way to connect external monitors to macbook pro?

I recently had to have the logic board in my mbp replaced and was wondering if disconnecting an external monitor while computer is on would cause the problem.
Should monitors be connected/disconnected with computer powered down?

If fact, the correct way to connect external displays is to have the MBP on, the external display on and seeking a signal, the external display cable connected to the DVI-to-VGA adapter (if necessary), and then connect to the MBP. So, the last connection is to the MBP, but everything is powered on. That way, the MBP autodetects the display.
Even if you don follow that procedure, connecting/disconnecting a cable from the DVI port would not do anything to your logic board.

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