I've got a Dell Inspiron 15 3000 series laptop, I was using it this morning with no problem but once I got back home I'd attempted to type and my keyboard wouldn't respond. I plugged in an old mechanical and once I did the computer registered all the key's I'd pressed and typed into the textbox I had been attempting to type in. I've tried a few things already to fix it but nothing so far has worked; any ideas as to how I can fix this predicament?