Mac freezing when hooked up to HDMI cable...

While presenting videos in class for teaching (like youtube and netflix) my mac freezes and lags when hooked up to an hdmi cable. Why?
It freezes at a spot and I hear the audio for a few seconds then it completely freezes-sound too.
In order to remedy this problem I have to unplug, shut down, and restart for a good 5 minutes. Not sure why this is happening but it hurts the flow of my teaching!
Help

I have been having a similiar issue where I use the HDMI dongle on my MacBook Pro (Late 2011) hooked up to an external TV/Monitor. After a couple of hours, the MacBook freezes with crazy sounds coming out the speaker and heavy pixelation on the screen. I reboot and it's fine again. I only had this issue when I started using the HDMI dongle. I been using the VGA dongle and everything works great.

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===========
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When posting in Apple Communties/Forums/Message Boards.......It would help us to know which Mac model you have, which OS & version you're using, how much RAM, etc. You can have this info displayed on the bottom of every post by completing your system profile and filling in the information asked for.
CLICKY CLICK-----> Help us to help you on these forums
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Message was edited by: Carolyn Samit

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Mac freezing when hooked up to HDMI cable...

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