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.
 
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)
 
translation: "Sorted out! I bought a new keyboard for the open market and made the exchange at home."
 
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