Question some times my desktop gone shutdown (fully shutdown, even smps fan gone off) and it take automatic restart. i can not identify the problem.

[soourav]

sometime it happened 3-4 times in one hour or it run 5-6 days without this problem. so is has no actual time to happen.
pc spec:
mercury h61tz mobo
Pentium g630
Nadia gt 610
4+2 ddr3 ram
500gb seagate
450w iball smps

[note:the problem first happened when i mixed ram (4+4) then i have no graphic card so i dont think it is problem about over load. then i remove the new ram but the problem not recovered.

 

[soourav]

then i check event log i showed this "Event41, Kernel-Power
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly"
pc spec:
mercury h61tz mobo
Pentium g630
Nadia gt 610
4+2 ddr3 ram
500gb seagate
450w iball smps

 

[jsmithepa]

This often signals a bad PSU.

Is this a new build? What kind of maintenance have u done to it lately?

 

[rgd1101]

if the PSU fan is off. replace it

 

[soourav]

if the PSU fan is off. replace it

can it caused by ups?

 

[rgd1101]

Possible . if you lost power and the UPS can't handle the load

 

[soourav]

Possible . if you lost power and the UPS can't handle the load

how to identify the exact problem.
2 days ago when electricity gone then ups was running, in 20 sec i faced same problem. and its power on and off( smps fan too) randomly 3-4 times.

 

[rgd1101]

read the manual to see how to test your UPS