Have I power down Macbook and monitor (or TV) before connect (or disconnect) through Mini DisplayPort to DVI (or Mini DP to HDMI) Adapter?

Can I hot plug monitor (or TV) through Mini DisplayPort to DVI (or Mini DP to HDMI) Adapter? Or  I have to power down all before connect/disconnect through Adapter?

Thank you, Mario.
I just wanted to be shure because previously i destroyed two videocards on my pc by plugging hdmi without power down.

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