Solved Custom build shuts down randomly, then restarts itself.

[GeneralChina]

Specs:

G.SKILL Ripjaws Series 8GB (2 x 4GB)
ASUS GTX660-DC2O-2GD5 G-SYNC Support GeForce GTX 660 2GB 192-Bit
Intel Core i5-4670K Haswell Quad-Core 3.4GHz
Seagate Barracuda ST2000DM001 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5"
ASUS Z87-PRO (V EDITION) LGA 1150 Intel Z87 HDMI SATA 6Gb/s
G.SKILL Ripjaws Series 8GB (2 x 4GB) 240-Pin
CORSAIR RM Series RM550 550W

Running Windows 7 Home Premium 64 bit.
A few weeks ago, custom built pc started to shut down randomly, I don't know the problem, I already did a full virus scan, nothing showed up. Usually happens when I'm surfing the Internet. Me and my friend built this computer, so I'm not sure if whether it is a hardware problem. Please help...

 

[matts6887]

i would say a hardware issue is not totally out of the question. i would download a program from the following link to a flash drive and run it through several passes to test the ram. The program is called memtest86+. It can be downloaded from the following link:

Memtest86+ - Advanced Memory Diagnostic Tool

If after running several passes memtest shows no issues; post back and we can go from there.

 

[GeneralChina]

Which version do i download?

 

[matts6887]

Look for the most recent version near the top of the page and download that version.

 

[GeneralChina]

Ummm so I opened up the case again, turns out a wire was loose (The fourpin), I tightened it and it was fine from there. Thanks for your help!