My PC not powering up

[Kankkunen]

This started yesterday, it would start and then suddenly shutdown mid boot. Happened couple of times until i cut power and started again after that, worked fine for the rest of the day.
Today however, it only starts for about 1 or 2 seconds before shutting down. Fans and gpu led starts for second but everything shutdowns right after.
Could this mean that my power supply is dying? Its oldest part of my rig

Specs:
Mobo asus z170 pro gaming
Cpu i5 6600k
Ram 16gb ddr4
Gpi gtx 1080ti
Psu coolermaster gx bronze 550w

 

[Phillip Corcoran]

Sudden shutdown well before Windows has loaded could indeed point to a failing PSU. That's where I would start anyhow (new PSU).

 

[Kankkunen]

Sorry for the late answer, forgot this thread. Yes it was indeed PSU, works again after i got new one. It served good 8 years before dying