jarotech :
Hi, what I suggest is to verify the connector for the keyboard, unplug and plug it back. Come back with the result.
Connections looked OK, tho i'm not a tech. I did reboot & tried continually tapping F12, it sort of then recognized keyboard & i was able to access. Opened up word & went through alphabet to check each key, all seemed good. Opened up excel & then got dialogue box that ctrl key was locked. Then no keys worked, other than the caps & num lock. Mouse still works & when i opened explorer scrolling the mouse changed the file views. Dbl click a folder & it opens in a new window.
Its a secondary work machine that i like to keep my accounting & business files on incase desktop crashes & handy when travelling, so its not used constantly & i update the files once a month. Seems odd to do this without warning.
I might also add that an external wireless keyboard does the same thing