What happened to my pc?

Mar 26, 2018
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About an hour ago I was playing Fortnite on my computer, then my game froze so I force shutdown my pc (held the power button) now When I start my pc back up it’s extremely slow, even after 20 mins i can’t click or open anything. I have no idea what happend. I was playing at 70c+ on cpu.

Rig:
I76700k
Gtx 1070 superclocked
8 gb ram
Hi-Fi biostar b150s1