If you have a #Dell laptop whose function keys act normally but whose Home and End keys do not, apparently the fix is the following.
* Restart your machine and at the Dell logo, repeatedly tap the F2 to get into BIOS.
* Look for POST Behaviour.
* FN Lock: Ensure this setting is Enabled.
* Make sure Lock Mode Secondary is selected.
Now I just have to find a sighted person to do this for me, because in 2025, BIOS is still inaccessible.