I can't hear my electric guitar.

I am using the M-Track and so far I didn't have any problem.
but today i've tried to connect my fender guitar and i couldn't hear it.
I tried to connect Yamaha basic keyboard and it did worked.
I tried to swich the "monitor mix", to play with the vol. and nothing seesm to solve the problem. my guitar is working okay with a regular amplifier.
Thank You
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