Home and End keys only function when holding Ctrl
Solution 1:
Try pressing F7. I cam across this because I was having the same issue after leaving for the weekend and coming back to my desk a mess from my cats. I leave my computer on so they must of hit something on my keyboard. After reading a bunch of different answers for help to fix my issue, I figured I should just try the buttons on my keyboard. Going through the F# buttons, I found F7 changed it so that I can use the home and end buttons again.