Trackpad issues with LCD projector

When I attach my MBA to LCD projectors, the trackpad ceases becomes stuck and useless. If I plug in a USB mouse, it works fine. Thoughts?

Firstly, make sure that you didn't connect to a external mouse, and try the Fn+F3 to see if it can work properly.
Try to do a EC reset by remove the AC adapter and insert the straighten paperclip into battery reset hole. Wait for few seconds then attach the AC adapter back on and restart the system.
Re-install the touchpad driver by uninstall the driver first.
http://download.msi.com/nb_drivers/tp/touchpad_elantech_11.13.7.5_0x7e3b3430_w8700.zip
If above can't help the situation, do a system recovery and try it again.

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