pc crash of minecraft

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What I expected to happen was...:
Describe what you thought should happen here
it should work
What actually happened was...:
Describe what happened here
what happended was i played minecraft and while i was playing the screen went blue and it didnt work i had to reset all over again
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...