laptop key 4[dollar] symbol not working

Solution
If cleaning didn't work and don't want your keyboard key replaced as suggested or don't have the cash to spend - shorter and cheaper fix is remapping the key. Takes time to get used to, sacrifice the least used key to stand for 4, but you will get it functional again in no time https://www.youtube.com/watch?v=uF0k9aA1LmQ and even better - https://www.makeuseof.com/tag/missing-key-remap-fix-keyboard-layout/ Best of luck.
If it is just the one key, I would first check to make sure nothing is stuck in it. Debris, food, liquid, lint, etc. Should that not resolve it then try an external keyboard and see if it works fine. If it does, then there may well be a problem with the attached one and either the key (if at all possible) or the whole keyboard would need to be replaced.
 

Moribund

Honorable
Feb 27, 2014
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If cleaning didn't work and don't want your keyboard key replaced as suggested or don't have the cash to spend - shorter and cheaper fix is remapping the key. Takes time to get used to, sacrifice the least used key to stand for 4, but you will get it functional again in no time https://www.youtube.com/watch?v=uF0k9aA1LmQ and even better - https://www.makeuseof.com/tag/missing-key-remap-fix-keyboard-layout/ Best of luck.
 
Solution