MacBook is slow and fan constantly keeps running

After an angry fit of me slamming my keys since it stopped working, my fan constantly keeps running and it became a bit slow.

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Well you did something the system is not liking ;-{

Lets see if you can get the onboard diagnostics to run so see if we can get an error code. Restart your system and press the D key

Reference: Mac startup key combinations. Let us know what it reports back.

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