I have an Acer Aspire 5000. Meets my needs just fine. Internet,word processing and such.

I had a problem with the DC charging jack. I took the thing apart and desoldered the jack and put the new one in.

My new problem is the keyboard connector. The edges borke allowing the cable to slip laterally not aligning with the pins. Man that thing is fragile !

Well I added a thickness of masking tape to make it wedge better. And it does. I thought I was in great shape. But then typing I notice that the M-key does not work. Is that a problem with the keyboard or the improvised connection (I hesitate to say fixed).

Dang............

hard to say, but I would imagine you may have a pin or connection bent.
use a mechanical pencil sans lead to straighten pins.