PC freezing issues

So, I've been dealing with this headache for a few months now. My PC just completely freezes up—like, total lockdown where neither the mouse nor the keyboard respond at all.... The only way out is a hard reset. I checked the Event Viewer, but honestly, I didn't find any critical errors or anything useful there. Here’s what I'm running:
CPU: Intel Celeron G1610 2.4 IvyBridge LGA1155
HDD: WD 320GB SATA II
RAM: 2x2GB DDR3 Apacer 1.5V dual Channel
Motherboard: Gigabyte GA-B75M-D2V BIOS F5
GPU: Radeon HD4850 DDR3 256
Windows 7 ultimate 64bit SP1 (fully updated)

I grabbed the drivers straight from the official site, installed those, and even tried the stuff on the DVD that came in the box with the motherboard. I figured maybe the RAM was acting up, so I ran MemTest86+ to check things out, then threw Prime95 and OCCT at it (ran them overnight), but no errors popped up and nothing froze during the tests. Then, a few days later... boom, back to freezing. I've actually swapped out the power supply twice now, and I just picked up a new xilence 600 w gaming series one, but yeah, same exact issue...
The Hard Disk Drive seems fine. I tested it using Western Digital Diagnostic tools in DOS and also inside Windows using HD Tune and HDD Regenerator. I even did a low-level format with the Western Digital Diagnostic tools. I made fresh partitions for Windows, but still nothing works...

CPU temps are sitting at: (Idle 28-34) and Full load (40 - 48)
GPU temps are: (Idle 36 - 40) and Full load (40 - 68)

I've even tried swapping through a few different Windows DVDs I grabbed from torrent sites (Windows 7, Vista, XP—both 32bit and 64bit), but the freezing keeps happening. I even went as far as trying genuine Windows installs, and no luck there either...

The weird thing is, I had these same issues with my old motherboard, an ASUS P8H61M LX3 PLIS R2. I swapped out CPUs and power supplies twice back then too, but the problem persisted. I thought maybe that board was just a dud, so I bought this Gigabyte GA-B75M-D2V, and now I'm right back where I started. 🙂

Here is what CPU-Z says about the RAM:

http://postimg.org/image/nzp04j1mh/
http://postimg.org/image/eem1q738b/
http://postimg.org/image/lkpa8zw1t/

I've downloaded the latest drivers for the chipset, Realtek audio, the GPU, and all the Gigabyte utility software from the manufacturer's official site. I also tried everything on the driver DVD that came with the board, but the problem just won't go away. Sometimes the PC runs fine for two days, sometimes five, ten, or even a month, and then it just locks up entirely. I've already tried resetting the BIOS (pulled the CMOS battery, moved the jumper, loaded factory defaults), but whatever...

ANYONE GOT IDEAS? HELP ME OUT 🙂

And just out of curiosity—what specific task actually causes your computer to freeze up on you?

Is there anything I can do to save some power, even when it's just sitting in idle?

Here’s what the screenshot of CPU-Z is showing

The image didn't show up!

I honestly haven't found a definitive cause yet.
Changing the BIOS Command Rate from 1 to 2 might help.
Have you tried bumping up the CPU Voltage just a tiny bit?
Did you enable an Overclock or something similar in the BIOS?
Is there a CPU power limit set in your BIOS? Not every board has that option, but yours might.
Could there be a virus or Trojan constantly trying to access the internet and freezing everything?
Or perhaps some software that's perpetually trying to connect to the web without stopping—unfortunately, that kind of junk exists.
Is it possible you have electrical interference (120V) bypassing the PSU filter and messing with the motherboard or chips? Are you in a city or a rural area? Is there a heavy appliance nearby drawing massive amounts of power? Do you have three or more refrigerators or freezers on the same circuit as your PC?
Those compressors can produce hellish interference whenever they kick on.

I really need to see a screenshot of CPU-Z.

Best regards,
B. W.

I have nothing to say about those voltage readings in the image.
Are you joking?
Either Core Temp isn't compatible with that motherboard/chipset
or this computer shouldn't even be running with those numbers.
Try using "Open Hardware Monitor"; perhaps it will read the voltages correctly.
You could also try swapping the power cable connections for the GPU or CPU.
If you are using that EVGA 600, you have two 12V rails at 18/20 amps each.
It won't work if one wire goes to the CPU and that same line feeds the GPU. The graphics card will drain that single line instantly.

Open Hardware Monitor


HWInfo

Unfortunately, they aren't compatible. You can't see the voltages here..
You have two options: either enter the BIOS and hunt for a setting that displays voltage levels...
..I assume the BIOS has this, though I'm not certain. Check it and maybe take a photo.
Alternatively, measure it manually on the cable inside the PC—the yellow wire toward the case or the black one.
It needs to be 12 Volts. Specifically at the graphics card. If you don't understand electrical currents, then don't touch anything.
And I'm curious about the clock speed on that HD 4850. Does it really drop all the way down to 160MHz on its own?
I had an HD 4870 once, and when I dropped below 200MHz, the whole system froze.
Do you need any software other than the driver and Radeon Software for the GPU?
Also, bump up the Intel voltage slightly, just a tiny bit, like +0.05V.

Best regards,

Sandra Cook60 said:Unfortunately, they aren't compatible. You can't see the voltages here..
You have two options: either enter the BIOS and hunt for a setting that displays voltage levels...
..I assume the BIOS has this, though I'm not certain. Check it and maybe take a photo.
Alternatively, measure it manually on the cable inside the PC—the yellow wire toward the case or the black one.
It needs to be 12 Volts. Specifically at the graphics card. If you don't understand electrical currents, then don't touch anything.
And I'm curious about the clock speed on that HD 4850. Does it really drop all the way down to 160MHz on its own?
I had an HD 4870 once, and when I dropped below 200MHz, the whole system froze.
Do you need any software other than the driver and Radeon Software for the GPU?
Also, bump up the Intel voltage slightly, just a tiny bit, like +0.05V.

Best regards,

I can't adjust the Voltage because of the chipset and the Intel, but the BIOS shows the voltages correctly, so everything looks fine there. As for the graphics card, when I'm actually gaming, the clock automatically jumps up to 993MHz if I remember right, but when I'm just idling, it drops down to 160.