Computer Turns Off After 1-2 Seconds

After putting everything together the comp was ok and it loaded into bios. After 10 mins my computer just shut off and when i tried to turn it on, it turned on for 1-2 seconds then it shut off again. It keeps doing it repeatedly i hear no beeps or anything. Ive assembled everything over again and no solution. The cpu has new paste between itself and heatsink. The only thing i find suspicious is that my motherboard as something that shuts it off if it suspects the system is overheating. I dont know what to do. Please help, any information would be useful!

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Computer Freeze, Screen Turns Black For Few Seconds Before Returning To Normal

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Computer Shuts Off After Couple Seconds

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