If this happens often consider getting locks for your hdmi cables or self locking cables.
Projector locking cable.
Hdmi connections don t fit as tightly as a component or composite video connection and sometimes slip out.
You first need to decide what cables you will be phishing.
Combo cable lock for notebook laptop projector pc desktop security anti theft.
There are a few ports in the rear ac power a locking port so you can use a security lock cable hdmi 1 and 2 a usb power only port at 2 a and a usb in port a service port audio out jack and a rs232c and a trigger port.
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We used this one however i think we found it on ebay for about 10.
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If your are running hdmi to the projector you should definitely consider buying an hdmi switcher so that you only need to run one cable.
An hdmi switcher takes 3 inputs and can switch between devices to the output.
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Universal 4 dial anti theft notebook lock combination laptop computer projector.
Make sure the cable is tightly fitted at both ends.
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Check hdmi cable connections.