My macbookair laptop is typing wrong characters like when i press the letter H it types ó


Open the onscreen keyboard and hit the H key and see if it actually activates another key. If it does then your keyboard needs replacing.

To enable onscreen keyboard in case you don't see it:
Open System Preferences and go to “Keyboard”, and look under the “Keyboard” tab
Check the box next to “Show Keyboard & Character Viewers in menu bar”
Pull down the newly visible Keyboard menu and choose “Show Keyboard Viewer”

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