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My PC randomly shuts down and restarts

Hi guys. My pc has been acting wierd and I cant figure out where the problem lies. It shuts down randomly and restarts every now and then. If the computer is off for around 3 - 4 hrs and then i try turning it on, it would work fine for about 45 minutes max. And then it shuts down and restarts. It would let me use it without any problems for 5 - 15 minutes and then it would shut down and restart again.The higher the number of times i let the pc shut down and restart, the shorter the time gets for it to shut down and restart next. It gets to a point where the computer restarts even before displaying the windows login screen and this continues forever.
This started more than a month ago but I never really had time to figure out the cause. I still havent figuered it out yet and thats why I need some help.
These are the things I have tried:
1. Updating drivers
2. Reinstalling OS (fresh install - win7 ultimate)
3. Changing OS from win7 to win10 (fresh install)
4. Updating drivers again
5. Removing graphic card
6. Uninstalling graphic card drivers
7. Dusting the entire cpu (ram slots and everything)
7. Replacing ram (1 stick. Tried both slots)
8. Reappling thermal paste on processor
9. Replaing motherboard
10. Replacing hard disc
11. Changing SATA cables
12. Unplugging dvd drive
13. Using old ram on new motherboard
14. Using new ram on new motherboard

So im guessing its either the SMPS or the processor which is faulty but I want to know your suggestion before I try anything else

My specs are:
Processor: Intel i5 4440 (http://ark.intel.com/products/75038/Intel-Core-i5-4440-Processor-6M-Cache-up-to-3_30-GHz)
Old ram: Corsair 4gb ddr3 1600mhz
New ram: Transcend 4gb ddr3 1333mhz
Old motherboard: gigabyte h81m-s
New motherboard: msi h81 m-e33

Thank you,

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All Answers

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Next step

In reply to: My PC randomly shuts down and restarts


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Nod to the PSU.

In reply to: My PC randomly shuts down and restarts

Pick a nice single rate with 50 or more Watts than what you have. In my decades of PC repair, we replace some 100+ power supplies to the one CPU.

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Will give that a try tomoro

In reply to: Nod to the PSU.

Ok. But is there any way to find out before hand if the psu is faulty. Ive tried this method: www.howtogeek.com/172933/how-can-i-test-my-computers-power-supply/amp/
...and my fan spins. So i want to be sure before I get a new one.

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