Read this article to fix the problem if your CTRL, Num Pad or Fn keys stopped working correctly.
How to repair laptop Control keys that have stopped working?
To fix this issue, the steps are quite simple. On your keyboard, locate and press the ALT + ctrl + fn keys. This should repair the problem.
If this doesn't work, double-check that the keys themselves aren't clogged with dust or other dirt by cleaning out your keyboard with a specialised keyboard cleaner. Use the steps outlined in this article to correctly clean your keyboard.
How to unlock Function (Fn) key?
If your keyboard is producing numbers instead of letters, hold down the Function key (Fn) on your keyboard in order to be able to write normally.
If this doesn't work, try pressing Fn + Numlk or, depending on the model, Fn + Shift + Numlk. On an IBM Thinkpad, press Shift + Scroll Lock Num.
How to fix your Num Pad in Excel?
If you are a Mac user, you may have encountered the following problem: suddenly, your Num pad of your extended keyboard stops working in Excel. You may have tried pressing all the F keys without success. The solution is elsewhere and is very simple: just press the Shift key and the Clear key at the same time. If you are struggling to find the Clear key on your keyboard, it is the key just above the 7.
And that's all - your Num pad is supposed to work perfectly fine in Excel.
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