Solve : Computer running very slow then shuts down.?

1.	Solve : Computer running very slow then shuts down.?
Answer» So I just got back from college and tried PLAYING on my PC that I haven't played on in about a year. I turned it on, it was loading windows then the screen turned black, looks like it rebooted, now the loading circle is GOING really laggy (5fps) and after I log into windows it becomes really slow, it SHUTS off a few minutes after. I've tired un-plugging all my connectors and no luck. It worked fine and fast before I left. I don't think it's overheating because I didn't FEEL any heat come from the cpu. My laptop also SOMETIMES has this problem. I'm at a loss to this. Specs: i5 4690k 8gb ram gtx 970 win10Most likely thing is a stuck fan. When not in use for awhile a fan can freeze or not run a full speed. Could also be the power supply? I had very similar problems with mine.

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