DIGIT-ARC read-only archive · snapshot: July 23, 2026

PSU issue? PC randomly turns off and motherboard lights go to breathing mode

14 posts · originally from https://geek.digit.in/community/threads/psu-issue-pc-randomly-turns-off-and-motherboard-lights-go-to-breathing-mode.210758/

sling-shot
sling-shot Original post #1
Dec 16, 2021 at 12:54 AM
I have an ASUS B350 Prime motherboard running Ryzen 2200G, 8x2 GB RAM, 2 x HDD config supported by VGUARD 600 Slender Plus UPS that had a new battery put in 4 months ago.

Recently I have been noticing that whenever there is a fluctuation in supply voltage, computer shuts down instantly with motherboard lighting going into 'breathing mode' (which is generally when the PC is sleeping) but no amount of pressing power or reset buttons brings it back. Only option is to totally shut off the UPS, wait a while and try to power it on. At this point sometimes it powers up normally but at other times fans spin for a second and die.

My little research on the internet suggests this could be due to faulty PSU. I have got the earthing checked and it seems to be no issue)

As this is my only PC, I don't have a spare PSU or motherboard to cross check.
Desmond
Desmond #2
Dec 17, 2021 at 7:43 PM
Which PSU do you use?
sling-shot
Dec 18, 2021 at 8:41 AM
Forgot the most important part, CX450 Corsair.
Desmond
Desmond #4
Dec 18, 2021 at 12:26 PM
How old is the PSU?

The symptoms look like a dying PSU. But could also be a loose contact of RAM or CPU. Try replacing both and check once. Otherwise just replace the PSU.
nac
nac #5
Dec 18, 2021 at 1:57 PM
It could even be UPS, so check that as well.
RumbaMon19
Dec 18, 2021 at 3:58 PM
Its more like ups caused issue in psu becoz of fluctuations which ups shud handle and protect the psu from
sling-shot
Dec 18, 2021 at 4:09 PM
Called UPS service guy. He checked and said no issues there.

PSU is 4+ years old.

My current supply is highly erratic.

Is there any point in getting PSU serviced?

What would be a good replacement today? Keeping in mind that somewhere down the line I plan to buy a beter processor and a basic graphic card capable of 1080p gaming.
RumbaMon19
Dec 18, 2021 at 4:18 PM
Called UPS service guy. He checked and said no issues there.

PSU is 4+ years old.

My current supply is highly erratic.

Is there any point in getting PSU serviced?

What would be a good replacement today? Keeping in mind that somewhere down the line I plan to buy a beter processor and a basic graphic card capable of 1080p gaming.

I think First thing u shud prefer is to arrange for a stabiliser, as even after fixing this psu, this will keep on recurring till voltage is fixed.
sling-shot
Dec 18, 2021 at 7:42 PM
Stabilizer > UPS > PSU > PC.

Is this a workable path?
sling-shot
Dec 21, 2021 at 10:38 PM
In case I decide to go for a new PSU and add a stabiliser, what PSU would be recommended for me?
topgear
topgear #11
Dec 29, 2021 at 2:37 PM
Corsair
RM650
CX650
CV650
VS600

Arranged via their quality. Pick any according to your budget.
sling-shot
Jun 30, 2022 at 9:06 AM
Corsair
RM650
CX650
CV650
VS600

Arranged via their quality. Pick any according to your budget.
I am planning a new build with Ryzen 5600g processor and B550M-A board. Plan to add a GPU (low to midrange) next year.

Is this list still relevant today? RM650 is priced at 8+ K on pcstudio.in right now. Will it be overkill for such a modest system?

My present PSU is CX450 I think.
sling-shot
Jul 12, 2022 at 1:53 AM
Bought CX550M. Hopefully it will be alright now.