External keyboard not working, nor is the external mouse (both known working) - just deleted the usb drivers and trying again.
Old Toshiba Satellite C660D
As for what's happened to it, I just got presented with it - no working can you fix.
Here is an old guide on how to remove the keyboard
Here are some keyboards - a majority of them about £9 with free shipping
The one that has the most sales is £9.29
You should really start paying attention about 27 seconds into the video where the guy lifts the keyboard off and exposes the ribbon cable underneath. They can be fragile so you dont want to yank on it too hard. Lift the keyboard a little and check the ribbon underneath. If its seated correctly, pull it out anyway and clean the contacts with rubbing alcohol or give it a wipe down and plug it back in again.
If you've plugged in an external keyboard and it still doesnt work then I suggest trying to uninstall any software relating to the use of HOTKEYS if you have something installed. Some laptops require you to have certain sofware installed to use the FN+F1 or whatever sort of keyboard short cuts. It could be a software conflict.
If not then just double check that you havent used a hot key to disable the keyboard - This sounds extremely obvious and quite stupid i know but I assure you its happened to people that have come to me before and all it took was an FN+(Key) combination to turn the keyboard or trackpad back on. Sometimes its the obvious things that people neglect to try out and they panic
Worst comes to worst. ship it to me and i'll do the work for a medium rare dry aged steak so long as replacement parts are supplied.