PC problem identification help!

[aaditya005]

My PC suddenly started misbehaving.problems are like windows settings are auto closing,PC apps crashing.its not software for sure as my copy is legit and kaspersky is always running.but just to be sure I formatted os,it didn't help.reinstalled cleanly,it didn't help.now its surely a hardware issue.smps is working fine.removed gfx card,it didn't help either, problem still exists.removed the ssd and loaded os again onto new ssd I bought.the only things left to check are ram and mobo.I doubted motherboard since bigging but obviously don't have another to check.I tested ram with mem86 and after testing it reported 0 errors which means ram is good too!but now real problem started ,after this test,I cannot log in !!!log in screen started flashing blue continuously. I can see log in screen but it in between blue flashes.what do u think the actual problem is?is it motherboard or processor?
BTW it is not monitor either!
In short:-
1)its not ssd,replaced with new one.
2)its not ram-memtest86 checked it,ram is working fine
3)not gfx card-removed it and still problem exists.
4)software is fine -reinstalled and still problem exist.
5)power supply is new one too(barely 6months old)
Possible culprits:-
1) mother board2) processor.
Thanks for reading till end.pls help me solve my problem.

 

[jay32267]

I was going to say.....I would still check the PSU voltages with HWMonitor or HWInfo to make sure they are OK....until I got to the part "I can't log in"....and I would also have checked the temps.

...but being you can't do this now....you could try a few things like resetting the BIOS....and trying to boot with one stick of RAM (if you have more than one)....but if those things don't work....then I would lean on that you are correct and it's the CPU or MB.