Computer restarts under load initially, then now at Windows! No BSOD. Help!!

WindWaterWinter

Reputable
Nov 14, 2015
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Hello all,

In the past few months, my desktop was experiencing restarts when I play games such as FarCry4, and now even L4D2. It will restart and then go back into Windows.

I thought this might be an over-heating issue, so I played the games after switching the air-conditioner on. The play seemed more stable.

However, recently, the restarting got worse.
One day I woke up and it just keep restarting on its own without going into Windows.
I took the components apart, remove as much dust as I can, and put it back together.
Things seemed fine after I did this, but I didn't play games.

Yesterday when I tried to play TERA, it crashed multiple times even before I got to the login screen in-game. This morning, it restarts after 1 or 2 minutes in Windows, but it seemed stable after I switched on the air-con again.

This desktop has been built for 2 years. Sporadically, it will give me the BSOD which I will just restart with no further issues. But the recent restarts did not have BSOD.

Any ideas on which is the faulty component? And is this due to overheating?

My current build as follows:
CPU: Intel i5-4670K 3.4 GHz
MB: Asus z87-Pro
CPU cooler: Coolermaster Seidon 240M
Ram: G.Skill (Rip Jawsx) 2 x 4G
GPU: Asus GTX770 2GB
HDD: WD 2TB Green
SSD: Samsung 840 Pro 128GB
PSU: FSP Aurum 92+ PT-650M 650W

I used SpeedFan and obtained a screenshot below.
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Thanks in advance!