freezing Computer FPS issues / Auto-Restarting / Hanging. Please help!

[Avile]

Specs: 
CPU: AMD FX-4300 3.8 GHZ Quad Core 
GPU: MSI GTX 1060 6GB 
PSU: Corsair 750M 
DVD Drive: 24X DVD±RW Dual-Layer Drive

For the past 4-5 months I've been having problems with my PC. For starters, I have a GTX 1060 and I'm getting low framerate in games like CS:GO, BF4, BF3, etc. Another problem is, my computer seems to hang quite frequently. It's such an inconsistent problem. For example, I play CS:GO regularly, 4/10 times, if I fire an AWP shot or if I do some other actions in the game, the computer just hangs. Sometimes, it'll restart itself after 5-10 seconds, other times, I have to manually power off my computer. It'll also randomly just restart itself, no hanging what-so-ever, just go black and restart as if I clicked restart myself. Just a note, I recently got this GTX 1060 around a week ago, thinking this would fix the problem, but it didn't at all. I did research and found out that my fans could be what's making my computer hang due to my CPU being overheated. So yes, my computer is SUPER dusty considering I haven't cleaned it in a year, so I bought some compressed air and cleaned the fans. Which fixed the problem for only about a day, then the hanging started again. I don't know why this happens at all. If anyone can help me that'd be amazing and thank you in advance.

P.S: These are the regular temps for my CPU: https://gyazo.com/367471e047e5a5b797f9e80d5218d034 this is also the regular temperature my computer is at, even when having games open like CS:GO. 

I also came across a review on my PC specifically, and this is the rating on it: https://gyazo.com/00c16404ba0ac25c815ad14b291eb871
Does this mean I have to buy a whole new motherboard? Or replace this heatsink because it fails to relieve heat. and how would I know what is the motherboard heatsink and what are some good ones that go with my motherboard? This is my motherboard model : https://gyazo.com/fc676fd097923b4dbface00c9f710ea8 So if I replace the heatsink on this board, does that mean the entire problem will fix? Or do I need to replace the CPU also? 

My computer when it hangs will do one of the 4 things: 
When it hangs, it just stays there until I have to force shutdown
It'll hang, but in 3-5 seconds it restarts itself.
It'll just restart itself randomly with no hanging
This one is typically the most frightening, it'll hang, and my computer will make a loud beeping noise until I force shutdown the computer. 

What do these mean? Is the heatsink the culprit of all of these issues? 

[The Owl]

Can you get us a photo of the PC interior? What model is your power supply unit?  What OS are you using? 

[AvocadosGuac]

You purchased a 1060... and a fx 4300?

 

Reinstall windows...

 

Just looked at your gyazo. New PSU. 12v rail is at 9v...

[Avile]

5 minutes ago, Jrock said:

You purchased a 1060... and a fx 4300?

 

Reinstall windows...

 

Just looked at your gyazo. New PSU. 12v rail is at 9v...

What does the PSU mean what's the matter with 12v rail at 9v? Is that a problem I can fix without buying a PSU? and will reinstalling windows fix my hanging issues?

[Avile]

15 minutes ago, The Owl said:

Can you get us a photo of the PC interior? What model is your power supply unit?  What OS are you using? 

I'm using Windows 10, and this is my PSU: http://www.bestbuy.com/site/corsair-cx-series-modular-cx750m-750w-atx-power-supply-black/8324202.p?skuId=8324202

[AvocadosGuac]

A reinstall would be the first thing i would do.

 

a 12v rail is kinda self explanatory. It should be running at 12v and yours is at 9.

[faziten]

The worst problem you have there is your PC name. 

Maximus SWAGPC ? Seriously. 

 

Now that out of my system: Check your PSU voltages, if HWmonitor reading is true, you have a big problem. You need a multimeter to discard this issue, software readings are worthless, but since the software readings are quite off, you have to check that. If you don't know how, watch a youtube video, and buy a cheap multimeter. They are very cheap and useful, won't hurt you more than a few bucks.