why my computer restarts randomly ?

[kanishmarsh]

Randomly, sometimes once a week, sometimes once every 2 days my computer Restarts. No errors at all and reboots normally. While Playing games (Battlefield 2, FIFA 2018, Sniper GW 3) and sometimes doing very light work such as web browsing)..Sometimes I can't boot the computer..when i press the power button it doesn't boot..then i Switched off my UPS and power it up again, after a while i press the power button and it starts (I have to do this quite randomly)

Gigabyte B85-D3H
Intel Core i5-4590 (Peak power 84W)
Sapphire R9 280 OC Boost 3 GB GDDR5 (Peak Power 220W)
FSP Hexa 550+ 550W 80 plus certified entry level Non-Modular ATX Power Supply
RAM Dual Channel Team Elite Plus 8GB DDR3-1600(CAS CL11)+Kingston 8GB DDR3-1600(CAS CL11) =16 GB
1TB WD Carver Black SATA 3 Hard Disk
160 GB SATA 2 Seagate Hard Disk
Prolink entry level 650VA UPS

what is causing my computer to be unstable?

 

[captaincharisma]

are you doing anything on it when the computer restarts? also, its possible it is getting a critical blue screen error and it restarts automatically when it does

 

[kanishmarsh]

are you doing anything on it when the computer restarts? also, its possible it is getting a critical blue screen error and it restarts automatically when it does

No blue screen bro.. Computer restart in normal manner..No errors at all

 

[Dunlop0078]

It will restart at idle? If it only does it under load what are CPU and GPU temps under load?

Your mismatched RAM could also cause that, mixing RAM even of the same specs is hit or miss. I would try either lowering speeds or increasing RAM timings and see if you still crash.

 

[captaincharisma]

are you doing anything on it when the computer restarts? also, its possible it is getting a critical blue screen error and it restarts automatically when it does

No blue screen bro.. Computer restart in normal manner..No errors at all

if that's true did you check event viewer? sometimes it can be too quick to see

 

[Dunlop0078]

I would say it has something to do with that RAM. Instability sometimes wont throw a BSOD or put anything in event viewer besides "kernel power failure" or whatever it is from the hard restart.

 

[zyh1987]

Hi,

have you tried to disconnect PC from ups? maybe your ups is dying?
also you can try to clean the interior of PC, especially the side of the power supply, dust build up in can cause short or high temperature.