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A very weird problem. For the letters a, o, s, and u, caps lock leaves them lowercase; it works for every other letter. I noticed it 3 weeks after getting the computer; I have a 1-year warranty. Any idea what this could be?

  • It happens in every program I have tried (word, notepad, chrome, and native windows 10 interfaces).

  • It also happens with the on-screen keyboard.

  • The shift key also has (a variant of) the same problem: after pressing any of the "cursed" keys, sometimes ALL keys will start being lower case.

  • It is fixed by making a new user (only for the new user)!

  • Disabling the program "autohotkey" which I installed does nothing.

  • Updating key/mouse drivers does nothing.

Specs: Lenovo Yoga 900 with 512GB ram & intel i7-6500u, 16GB ram. Windows 10 home.

  • Always? Every program or app? Including a basic editor like notepad? – Tyson May 31 '16 at 3:30
  • Yep. Notepad, word, even the start menu search aND THIs VERY CoMMENT. – doublefelix May 31 '16 at 3:33
  • Just noticed: if I type the letter twice or more it goes capital, with caps lock on: so I could type "YYuUIIoOPP" for example. – doublefelix May 31 '16 at 3:36
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    Nahh.. OP said the problem exists with the OSK as well so I wouldn't call it a hardware issue. Must be something in the computer which I cannot tell without looking at it – pun May 31 '16 at 9:33
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    Does this also happen if you are typing while holding down the Shift key, or does it only happen with Caps Lock? – Moshe Katz May 31 '16 at 19:29
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Warning! Keylog alert... lol

Execute your Windows in safe mode and test.

If solve problem in safe mode, maybe have a keylog install cause this problem when computer run in normal start. Execute msconfig to see what programs is running when windows start.

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But, if in safe mode the problem persist look about this program https://sharpkeys.codeplex.com/. With them you can remap key on your system.

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