Question Computer only boots for a second

[Zingaro]

So I have an issue where my computer a few days ago randomly turned off and would only turn on for a couple seconds before turning off. I have had this computer for years with no problems.

I remember holding the power button for 30 seconds and trying again a day later and it worked for about an hour before windows shut down and same issue occured.

I have tried a new PSU but same issue occurs. I have reseated RAM, and made sure fans were all working but same issue.

Today I applied new thermal paste to my CPU and reset CMOS and tried again with nothing but my monitor plugged in and it got to windows user login screen but when I plugged in my keyboard/mouse it turned off again(not sure if coincidence or not) and same issue occurs.

I assume it's one of my motherboard or CPU(pins look fine on both). Is there any way to know which is more likely(or other potential problems)?

I've had all these parts for about 5 years minus both HD/SSD for 1 year and ram for 2 years
Specs:
CPU I7-6700k
GPU MSI 1060
MB Gigabyte GA Z170x gaming7
Fan Phanteks PH_TC12DX
PSU Evga 650GQ/Corsair RM650x(replacement)
Ram Tforce ddr4 16GB x 4
HDD 2TB Seagate
SSD 1TB xpg

 

[JohnBonhamsGhost]

include your complete system specs;
make & model of ALL components along with their time in use.

 

[Zingaro]

include your complete system specs;
make & model of ALL components along with their time in use.

Sorry edited them in now

 

[BartPC24]

Sorry edited them in now

Hello, have you checked "electric part" of mobo ? I mean if the paths at the bottom are ok, or if any of the capacitors aren`t in good shape ?. If possible, kindly please post some photos of the mobo in "looking from the side" view

BR,

BartPC24