Alesis VI49 Key stopped working

I have been using an Alesis VI49 midi keyboard for months until one day the second E Key stopped working with any midi software like Logic, Garage band, etc.. If I plug in the alesis with an external midi module like a waldorf synth or any other synth then the Key works perfectly, but if i hook up the alesis to my Mac Pro, that key doesnt work.. it used to work before.. i dont know what to do
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