CPU or Motherboard problem?

Greetings from Finland,

I need some help with diagnosing a problem with my PC, i am going to explain how the problem started:

Christmas eve, my pc was working fine and seemed like there's no problem in the world but suddenly i lost all power to my screen, keyboard and mouse, the pc wouldn't shut down by pressing reset/power button so i tried smelling if something got fried but didn't smell anything wonky so just decided to pull the plug and that of course, helped.

After letting it cool and inspecting my motherboard i didn't find anything wrong so just tried starting it back up and the same problem appeared, screen didn't show anything not even can't find signal or anything, also my keyboard and mouse seemingly had no power and i couldn't shut the pc down without pulling the plug.

Had a friend over and i was brainstorming with him and thought it was either CPU over heating or my mobo breaking down.

So i decided to switch out my old mobo and CPU (note that i currently have no thermal paste and soonest i can get some is Monday. After switching mobo and CPU my computer was fine, no problems whatsoever expect fps drops when playing but that's understandable since my old CPU was outdated.

After a while i tried attaching my old mobo and CPU back in and it worked like a charm for about 5 hours (gaming).

Could anyone help me with this since i am still currently learning and can't seem to diagnose this.

Specs: Radeon R9 290x, AMD FX-8320 8-core, Gigabyte GA-970A-UD3P.

My old mobo and CPU that worked fine: ASUS M5A97, AMD Phenom 2 x4 965

Thank you in advance!

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Seems you nailed it.

OLD board is fine, new board is not. Most boards have a warranty so use that next.

In parting here's a thing. To diagnose if it's a motherboard you swap in a working board. You did that!

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Still unsure

Do you think there's any reason to get thermal paste before buying another mobo and trying to switch the CPUs? Because i switched the sets of mobo+cpu since i don't have any thermal paste, can you diagnose if this could have anything to do with my CPU?

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It's rarely the CPU.

You can watch many youtubes but it's rarely the CPU. And I've never found missing paste to matter for short testing on that model CPU. I can make it to the BIOS but you didn't get that far.

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If I'm reading this correct

You had a problem.
You swapped a part and the machine works.
You then put the original part back in the machine and the machine works.
That tells you nothing.

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Problem is...

Well the problem is that after switching it back to my "new mobo+cpu" it worked for 5 hours, after that it didn't so i am back with more questions than answers.

Can't remember ever having this problem that it suddenly stops working without overheating..

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