An hdmi switcher takes 3 inputs and can switch between devices to the output.
Projector locking cable.
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Make sure the cable is tightly fitted at both ends.
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.
We used this one however i think we found it on ebay for about 10.
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Check hdmi cable connections.
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If this happens often consider getting locks for your hdmi cables or self locking cables.
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Hdmi connections don t fit as tightly as a component or composite video connection and sometimes slip out.
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.