System resarting frequently

[mayflower73]

My configurations is as-
Intel core i5 4440 @ 3.10ghz
4x4 8gb Corsair vengence ddr3 RAM
ATI AMD Radeon R9 200 Series (MSI) graphic card
465GB TOSHIBA DT01ACA050 (SATA)
1863GB Western Digital WDC WD20EZRX-00D8PB0 (SATA)
SONY DVD RW AD-7260S
Seasonic M2 620w PSU modular.
Iball UPS 600va/360w
Windows OS 8.1 64bit.

My system keeps restarting for strange reasons frequently, I checked for virus activity but none. The CPU cores have fluctuating temps ranging from 34-40 celsius which i suppose is not an issue. Cabinet is a Coolermaster well vented cabinet. I built this Gaming machine from ground. Is it a power hog and not getting enough juice from my 620w SMPS?

Kindly advise me what to do?

 

[Barney6262]

Hello,
the power supply should be sufficient.

What are you typically doing when it restarts? what are the temperatures on components? (Check temps with 'Speccy' : https://www.piriform.com/speccy/download/standard)

 

[the bboss]

From what ive heard it seems that the power button might be faulty or stuck on. as if glue was in it. also try updating the computer and checking for malware

 

[Barney6262]

From what ive heard it seems that the power button might be faulty or stuck on. as if glue was in it. also try updating the computer and checking for malware

How is he meant to check for malware when the computer wont turn on?