HELP! my alt key is stuck, pressed, but not (Not physically)

I have a macbook pro 13 (mid 2012)
my alt key is stuck, pressed, but not.
When I type, symbols appear instead of letters, as if pressed.

The mac already connects directly to selecting discs, as if pressing alt.
 

chevy

Marvelous Da Vinci
Staff member
Mod
If you need to go further you can try this:

(Make sure you see the full videos with the warnings at the end before you try)
 
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