PC keeps restarting with no clear reason

tharindu207 · Sep 17, 2017

Hi, I have an i3 computer that is about 2/3 years old. Last week my power supply was giving me trouble so I replaced it. I also changed my ram from a 4gb one to 8gb one. Computer worked fine till today.

Since this morning my computer keeps restarting after a while. It does boot up completely. And I can work as usual, but then it suddenly restarts. When it restarts it shows that it didn't shut down correctly and let me boot in safe mode. But whatever I do, sooner or later it automatically restarts again.

All my drivers are up to date. I scanned for virus, found nothing.

EDIT: Few more details. I checked with speccy, system and cpu temperature is around 60C.

i3 3.Ghz processor
DDR3 8GB 1600 ram
MSI H81M motherboard
GTX 1050 Ti Gigabyte VGA
Windows 7 64bit SP1
CoolerMaster 400w power supply

Sedivy · Sep 17, 2017

http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html
CM's 400 elite which is the precursor to the current 550w elite is likely not a great psu. The 550 version is ranked tier four. If you read the link above, you'll see why. Considering all this started with the psu I'm inclined to think that you shiny new psu isn't outputting the right voltage and the mobo shuts down as a result. Probably as soon as there's any increase in load.
Try taking it to a repair shop, have them put in a different psu and see if it still happens.
You can also open the event viewer around and check for critical events around the time shutdowns happened. PSU issues are never listed as psu though. Usually other things shut down because of the psu so events will just give generic hardware errors.

tharindu207 · Sep 19, 2017

Sedivy :

Hi, thank you for the reply. But it seems to me that the PSU is not the issue. I tried a different PSU and the problem persisted. What else could be the cause?

The Paladin · Sep 19, 2017

you system consumes between : 46W - 196W based on what details you provided. so a 400w power should be able to handle it.

Questions:
- Do you have the motherboard to the latest Bios ?
- have you tried putting your 4gb of ram back in and taking that 8gb ram out and see if the system becomes stable again ?

m.ramaneeshwar · Oct 9, 2017

Hello my friend,some details on cpu and motherboard temperatures would be useful,and if you have access to a multimeter,check the leads of psu individually using it,if the leads are delivering voltages within the tolarable range,then the prob is not from the psu,
Also test the ram sticks individually using memtest86,
As another option,try updating and defragmenting the registries as a increase in ram size may have some effects in the registries
And can you upload us the error details after the event ??

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