Question After pressing power button, power fluctuates and computer stuck on restart loop

[Leon7]

When i press power button of the computer my room's lightbulbs shows power fluctuation and then my computer restarts and keep restarting until i turn off my computer's ups for few minutes and then it starts as normal. it happens randomly 1-3 times in a day.

It started happening when i changed my cpu from i3 6100 to i7 7700k and for that i had to update my motherboard's bios too. so i thought this new cpu is faulty so i took out the new cpu and install my old cpu(i3 6100) but even after that my computer stuck on loop restart when i press my computer power button but happens only 1-3 times a day.

I unplugged everything like monitor, ups, keyboard , mouse, graphic card, hdd, rams etc only 4 things used motherboard, cpu, cpu fan, psu(smps) but even then its keep restarting i can tell by looking at the cpu fan when it kept on & off. so i know its motherboard, cpu or psu that is faulty (i already changed cpu fan) but i cant figure it out without changing all those things one by one and it will cost me way too much if i get it wrong first two times.

I removed UPS and plugged the computer directly to the electric sockets but no good.
also used only ups and removed the ups plug from electric socket and get it on the ups battery only but still no good.

I tried to install my previous bios(thinking may be updating bios causing this problem) but it cant be install that one after updating to latest so i installed some other old version bios that can be installed but still no good.

The problem could not be outside of computer because i used only ups and removed the ups plug from electric socket and get it on the ups battery only but still no good. also every other electrical appliance when plugged in runs well without any fluctuation, it only happens if the power button of the computer is pressed...

so my question is how can i be sure what is faulty in those 3 things without changing it one by one?


my computer's configuration-

motherboard- gigabyte h110m-h
cpu- intel i3 6100
psu- Corsair TX550M 550W 80+ Gold
graphic card- gigabyte 2060 super
ram- corsair 4gb & 4gb other brand
ssd - samsung 250 gb
hdd- western digital 1000 gb

 

[Ralston18]

What PSU is installed: make, model, wattage, age, condition (original to build, new, used, refurbished)?

History of heavy gaming use?

UPS: make, model, age, condition? How old is the battery?

= = = =

Regarding:

"when i press power button of the computer my room's lightbulbs shows power fluctuation"

If the room's lighting is flickering that could be a sign of some electrical problem.

Overall, the computer/PSU and other connected devices may be drawing more power than the circuit can handle.

Or something else is going wrong. Get a qualified electrician to check outlets, lights, etc..

Objective being to narrow down the potential problem(s) as much as possible.

 

[Leon7]

What PSU is installed: make, model, wattage, age, condition (original to build, new, used, refurbished)?

History of heavy gaming use?

UPS: make, model, age, condition? How old is the battery?

= = = =

Regarding:

"when i press power button of the computer my room's lightbulbs shows power fluctuation"

If the room's lighting is flickering that could be a sign of some electrical problem.

Overall, the computer/PSU and other connected devices may be drawing more power than the circuit can handle.

Or something else is going wrong. Get a qualified electrician to check outlets, lights, etc..

Objective being to narrow down the potential problem(s) as much as possible.

Psu- Corsair TX550M 550W 80+ Gold, Bought New on Jan 2020, Condition is good never been repaired.

Not a heavy gamer just play street fighter 6 with low settings

UPS- Luminous Pro 1000, 1000 watt, battery is good (15 min or more backup)
UPS is irrelevant because i removed it and plugged the computer directly to the electric sockets.

The problem could not be outside of the computer because i used only ups and removed the ups plug from electric socket and get it on the ups battery only but still no good. also every other electrical appliances when plugged in runs well without any fluctuation, it only happens if the power button of the computer is pressed...

 

[Ralston18]

3 1/2 year old 550 Watt PSU is a likely suspect then.

Two reasons:

1.) simply through age and use the PSU may be nearing its' built in EOL (End of Life) and starting to falter and fail. No longer able to fully respond to power demands especially at peak values or sudden increases.

2.) the interim CPU (i7) power requirements may have reached some increased power threshold that the PSU could not sustain and could no longer do so thereafter. Even if the i3 was reinstalled.

Do you have access to another PSU that can be installed for testing purposes? A higher wattage if at all possible.

FYI:

https://www.tomshardware.com/reviews/best-psus,4229.html

Not with the intent of going out and immediately buying a new PSU.

Just read about PSU's and apply 2 or 3 of the calculators to determine the applicable PSU wattage for your build. If any components provide a wattage range then use the high end value.

 

[Leon7]

3 1/2 year old 550 Watt PSU is a likely suspect then.

Two reasons:

1.) simply through age and use the PSU may be nearing its' built in EOL (End of Life) and starting to falter and fail. No longer able to fully respond to power demands especially at peak values or sudden increases.

2.) the interim CPU (i7) power requirements may have reached some increased power threshold that the PSU could not sustain and could no longer do so thereafter. Even if the i3 was reinstalled.

Do you have access to another PSU that can be installed for testing purposes? A higher wattage if at all possible.

FYI:

https://www.tomshardware.com/reviews/best-psus,4229.html

Not with the intent of going out and immediately buying a new PSU.

Just read about PSU's and apply 2 or 3 of the calculators to determine the applicable PSU wattage for your build. If any components provide a wattage range then use the high end value.

so you think its psu, but i dont have any other psu, i have to buy it. i want to buy only if its faulty but i guess there is no way i can confirm it without changing it..... probably i have to buy it first in all those 3 things.

 

[Ralston18]

If you have a multimeter and know how to use it or know someone who does you can do some PSU testing.

https://www.lifewire.com/how-to-manually-test-a-power-supply-with-a-multimeter-2626158

Not a full test because the PSU is not under load.

However, any voltages out of tolerance would indicate PSU problems.

 

[Leon7]

It is the PSU, i changed it and its been working well since then, thank you all...