System Crashing Randomly!

[Seanoog]

Hi hope I can get some help with my system crashing randomly.

Intel i5 2500K (Stock)
Thermaltake Venomous X (2x14CM Fans)
Cooler Master CM-690II
Asrock Extreme 4 Gen 3 (UEFI 1.0)
Corsair XMS PC1333 (4x4GB)
zalman ZX 850W Gold Modular.
Sapphire 6950 Toxic (Unlocked to 6970).
Samsung SH-B123LBSBP BLU-ray.
Samsung F1 1TB Primary.
Samsung F4 2TB Secondary.
Dell 2407WFP DVI Port.
Windows 7 64Bit Retail.
CAT 11.10 BF3 Preview 2 Drivers.

I had been running the system stable for just over a month.
An last night it starting throwing wobblies.

Initially I was playing Kerbal Space Program, an the screen just froze.
No BSOD, or HDD clicking, No Sound, Mouse/keyboard inputs none responsive.

So had to do a hard reset, to start windows again.
Almost within minutes of windows loading, an at desk top it happened again.

Since then I have had the system lock up in exactly the same way in:
BIOS UEFI interface.
DOS.
An windows.
Also any stress testing (Prime 95 or games) locks the system in the exact same way.

Presently I have reset the CMOS.
Removed the Radeon GPU - Running off CPU-GFX.
Removed the Samsung 2TB HDD.

An yet the system still crash's when ever it likes.
Initially I though a corrupt Hard drive or a virus, but even crashing in the BIOS an DOS splash screens is odd.
Has any one ever encountered this problem?
Would it likely be a Hardware or software fault.

After posting this I am going to take RAM out, an reinstall windows.
Any help or advice would be appreciated.

 

[Seanoog]

Run the latest memtest for a few hrs - from a bootable ISO - link

If it throws up errors test each stick individually.

EDIT: I would do this before you re-install windows as if it gives out errors straight away (within 1 hr) it will save you a lot of time.

Thank you.
But how? I have formatted the USB pen, an installed the latest version on the Pen using the .exe file.

Set up boot priority in BIOS to use USB ports first, but it still loads windows the is third option.
I have tried F11 an manually choosing the Pen but still doesn't work!

- On a side note. Its very much looking like faulty RAM or a Poor connection between the RAM as, I am now running with one module an the system is stable-ish.

 

[Seanoog]

Thanks every one.
Been busy the past few hours.

Windows is updated, to the latest version.
Bios was also updated to version 1.1 latest version.

Been trying different configurations of the Ram sticks in different modules.
Can't get a conclusive stable system, especially not in Prime 95 Blend.

The initial random crashing, was some thing I had never encountered before after years of building systems. But now that I can almost definitely confirm its either ram sticks or Ram modules on the motherboard at fault, this was to be expected.
I bought both from a competitor, an when initially building the system, it also show memory problems.
- It would never POST if all modules where used, I RMA'd the parts but competitor never found a fault. On receiving the parts back the problem had gone?
I'll definitely be contacting them, an continue to fix the problem. Immensely frustrated...

On inspection I could never find any issues or missing parts (resistors or capacitors) off the motherboard. All Ram sticks happily work on there own, in module 1.
As of yet, been unable to get memtest to work, will keep trying.

I appreciate the help, an i'll update once I know more.