My computer starts and instantly shuts down repeatedly

Please help out

Prominent
Apr 12, 2017
2
0
510
I had this computer for about 3 years now and it hasn't had any issues.
So yesterday I left my computer on, and when I woke up in the morning today and booted it back up again , it worked fine. For about 3 minutes then it shut down instantly. Now it's stuck in a repeating loop where it turns itself back on and off again. I have no clue what to do and need it fixed asap.
 

Please help out

Prominent
Apr 12, 2017
2
0
510
Also, I haven't added any new parts to the computer and I have cleaned out all the hardware in the case, mainly the fans. I did a check to see if my power supply ran and the fan spun around slowly relative to how fast a fan would normally spin. Also I noticed a noise out of the power supply which I haven't heard before this event. Idon't know if this is the problem.
 

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