Cpu 100% usage issue, help?

May 18, 2018
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Hello and hope you're having a good day 🙂
To avoid TLDR I'll cut to the chase: I recently (january 2018) built a beautiful blyat machine, mostly for gaming (specs down below) and been using it for 10+ hours a day ever since. Last couple of days after I enter my password cpu usage would go all the way up to 100%, but in Task Manager all processes were using 0% cpu. Just a min ago I restarted it to check if it would fix it (as I did the other times) but upon restarting the cpu fan went up to almost max rpm and then it stayed on black screen. I have not mentioned this yet but I've done no overclocking on anything. I tried to boot it again, nothing. And again, once more, but nothing. On my 4th try it did boot, seems fine now. Any ideas?

My rig:
Intel i5-7600k
Gigabyte Geforce gtx 1060 6gb
8gb crucial ballistix ddr4 ram
Msi z270a pro
A pretty nice cpu cooler)(can't remember the model, promise its not cheap)
Seasonic S12II 520W
Samsung 850 evo 250gb (Windows)
Old 640gb hdd (wd if I'm not mistaken)