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[SOLVED] arduino leonardo stops transmitting once hdmi cable is connected to a screen

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at89atbits

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I am using arduino leonardo for moving mouse pointer with head tracking using MPU6050. It works fine in general. But as soon as I connect an external lcd screen to my laptop via hdmi cable, it stops transmitting. (that is the TX led goes off altogether and the mouse stops moving) I am not able to figure out what the issue is here Will using a teensy 3.0 instead of leonardo solve this problem?
 

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