Help Please PC Freezing Randomly - Not RAM or Hard Drive Issue

[Liamo9321]

So over the past few months my PC has been freezing randomly. I have no idea why this keeps happening.

Specs are as follows:
DDR3 8GB (4x2GB)
GTX 670
Gigabyte 970A-D3 (rev 1.1)
Seagate 1 TB SSHD (Brand new, happened with old HDD too)
AMD FX - 4170 Quad-Core 4.20 GHz
64 Bit OS Windows 7
Corsair 650W PSU

I have run a Memtest, left it for 24 hours and didn't get a single error, I have cleaned out my PC with compressed air. I have also reapplied thermal paste to my CPU and Heatsync. I'd really appreciate some help and if you need any more information I'll gladly oblige.

 

[singemagique]

What type of freezing are you experiencing? Are you getting a crash to a blue screen, any visual artifacts (ie. tearing or vertical lines)? Have you tried swapping out the PSU? Sometimes a failing PSU can cause some bizarre symptoms.

 

[Liamo9321]

What type of freezing are you experiencing? Are you getting a crash to a blue screen, any visual artifacts (ie. tearing or vertical lines)? Have you tried swapping out the PSU? Sometimes a failing PSU can cause some bizarre symptoms.

it's a complete freeze, no blur screen, no sound repeating itself, just the image stays on screen and needs a power reset. Keyboard commands also don't work. I will try swapping a PSU later today.