windows - Diagnosing Random Computer Freezes

I bought a desktop computer a few months back. About 3 months ago it started freezing at random intervals, sometimes as much as 2-3 times per day, other times as little as once per week. The specs are as follows

• CPU: Intel Core i5 3570


• Motherboard: ASUS P8Z77-V LX


• Video Card: EVGA nVidia GTX 660 Superclocked


• PSU: Corsair CX500M


• RAM: Corsair Vengeance 1600MHz 8GB


• HDDS: Sandisk Ultra-Plus 128GB SSD, Seagate Barracuda 1TB HDD

The freezes occur randomly, although i've never seen it freeze while in a fullscreen game, usually they occur while i'm browsing the internet/streaming a video, the most recent happened while half screening a game and a video.

I've sent it in to the manufacturer, they sent it back with nothing fixed claiming they couldn't get it to freeze at all. I sent it back, told them there HAD to be something wrong, they replaced the motherboard and video card, (yet still claimed they couldn't get it to freeze) the freezes still occur.

Steps I have Taken to Diagnose it

• CPU: - I have ran a few CPU tests on it, so did the manufacturer, they've also run furmark on it, Lynx, and many other CPU tests that I did not. This is ONLY thing i'm actually suspicious of (just because EVERYTHING has been replaced BUT this), but apparently the manufacturer couldn't get the computer to freeze for them (over the span of 2 months btw)




• Motherboard: - The motherboard was replaced, the problem persisted across both motherboards. The BIOS has been updated 3 times, problem persisted across all three. The only thing I could think of here would be that I have the motherboard set on default, (and so did the manufacturer) the problem has persisted whether i've manually timed the RAM and CPU speeds and all that, or if I have it defaulted, or if I use X.M.P




• Video Card: - The Video card has been swapped out for a 5770, and a different 660, problem persisted across all




• PSU: - The PSU has been replaced with a 600W Thermaltake TR2 and then back to the 500W, problem persisted across both




• RAM: - Ran MemTestx86, and Windows Memory Diagnostic, swapped out the sticks for a different pair, problem persisted across both pairs. I've also bumped up the voltage at 0.05 intervals at the request of the manufacturer, still nothing.




• OS: - Switched between Windows 7 and Windows 8, both clean installs, each has been installed 2-3 times to no avail, the ONLY thing I could consider would be that i'm not installing the drivers correctly? I went to the ASUS website, got the intel chipset driver, the intel management engine driver, realtek audio and lan driver, and the nvidia driver, don't know if I need anything else.




• HDDS: - I've swapped out BOTH HDDs, the 1TB Seagate is a personal drive and I remove it whenever I send it out for repairs, but I don't suspect it to be the problem as it's been swapped out with a different drive too, and it still froze. I've tested the system with 2 different SATA cables, a Seagate Momentus 5400RPM HDD and a Brand new (now returned) Western Digital Caviar Blue, neither worked.




• Other: - I've tried plugging in the computer to a different and secluded outlet, i've tried it with a different keyboard (Razer Lycosa --> Logitech G510S), and a different mouse (Razer Naga 2012 --> Razer Naga 2014) Still nothing

Additional Information

The temps are always within normal range on this PC, it has frozen with and without an antivirus, it is always running Razer Synapse in the background, which is the only thing consistent thus far. The only thing that changes between me having the computer and the manufacturer having the computer where it apparently doesn't freeze is the second HDD which has been swapped out and the problem persisted.

There is NEVER a BSOD, and the speakers don't loop, they just cut out.

The drivers i've installed

• The current nVidia driver


• The current Intel Chipset Driver


• The current Intel Management Engine driver


• The current Realtek Audio Driver


• The current Realtek Lan Driver


• Razer Synapse


• Logitech Gaming Software

Aside from that, I can answer any further questions, I will greatly appreciate any help in solving what I can only assume is a ridiculously annoying mystery.