All was well for 2 years until last week my function keys (entire top row F1 - F12 including the F-Lock key) stopped responding. Most solutions to fix this issue recomend hitting the f-lock key. This of course is not working since the key itself is not working.
I tested the keys on www.keyboardtested.com
Every other key works except none of the function keys.
My keyboard s the wired Microsoft Natural Ergonomic Keyboard 4000 v1