computer freezes

[weltauge]

Hi,
Since getting new PSU, mainboard, RAM and CPU my system often freezes for about 1 to 15 seconds.
OS: Win 10 Home
mainboard: ROG STRIX B450-F GAMING
CPU: AMD Ryzen 5 2600 Six-Core Processor 3.40 GHz
GPU: Nvidia GeForce GTX 1050Ti
RAM: G.Skill F4-2400C15-8GTZRX
PSU: some "Cooler Master" 550 watts

Temperatures and workload of CPU and GPU seem fine to me.
Chkdsk did not find problems.
No virus. No unnecessary programs.

What could be the cause and how to find out and fix?

 

[StandartBlitz]

This is definitely strange - if you are sure it is caused by the psu it could be voltage fluctuations since as far as i know cooler master only re brands cheap power supplies. Which 1050 ti do you have? In case it's cheaper one it could have problems delivered the necessary voltages and therefore creating errors. Can you run games or other gpu demanding tasks?

 

[michalrz]

If by freezing you mean the cursor also stops, then it's quite often the hard drive.
You didn't mention a new drive though - what drive is it? Can you download Crystaldiskinfo and see/post a screenshot?