Some program/ application is stopping me from typing small letter "o"

[Steven Cheng KC]

Few days ago I found that I can't type one specific letter, the small letter "o". At first I thought it is the keboard malfunctioning, but I tried all methods I can search and even plugged in a new keyboard but none of them work. One thing make me so certain that my keyboard is working - I can type the capital letter "O" pressing "shift" and "o" with caps lock off; and while with caps lock on, I can type "o" with "shift" and "o". I also tried "ctrl" "o" in Chrome, the window for opening a new file will pop out normally.Also, I can type "o" in the password box before logging in to my user. Afte

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