Brand new pc with second hand 400 watt psu restarting randomly

A week ago I builded a brand new pc but I used a second hand circle 400 watts psu.
Plzz NOTE: pc was assembled and also windows and softwares were installed by a expert hardware engineer so, there is no chance for mistake.
After using 2-4 days it was fine but then pc started to restart randomly whether I am gaming,surfing web or just idle. Temperature of cpu varies from 26°c-28°c and temperature of gpu varies from 40°c-45°c. I have not tried any diagnostic yet.
Spec:
Pentium g4560
Gt 1030 2g gddr5
8gb ddr4 hyperX fury
Wd 500gb hdd
Gigabye H110m-s2 motherboard
Circlr 400 watts psu
Should I change the psu? Plz reply any help will be appreciated.
Thanx in advance
Reply to snaved159
4 answers Last reply
More about brand hand 400 watt psu restarting randomly
  1. Well the PSU is a mistake, it's really only a 300w PSU if it can actually handle 300W.
    Reply to jankerson
  2. So it means I should change the psu? If yes can u suggest me some good psu?
    Reply to snaved159
  3. snaved159 said:
    So it means I should change the psu? If yes can u suggest me some good psu?


    Look at this list, pick something from Tier 1 or Tier 2.

    http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html

    Or something from the 1st 3 Tiers on this one.

    https://linustechtips.com/main/topic/631048-psu-tier-list-updated/
    Reply to jankerson
  4. Thank you very much
    Reply to snaved159
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