Computer freezes shortly after boot

[Skizofrenic]

Hi, I am going insane here. My PC freezes up relatively fast after I boot. It boots just fine, but when I get to desktop it'll freeze up completely.

Here's what I have tried so far:

Memtest on RAM-sticks - didn't show fail. Also tried each stick on its own (in different slots)
Updated drivers
Temps seemed fine (CPU around 35-40 on idle)
Tried running without GPU and just run onboard This happened, as well as the freezing: http://imgur.com/bpLDnNP
Ran every HDD/SSD on its own
Format and install Windows from scratch on all 3 drives.

I have not yet had the opportunity to try another PSU unfortunately.

Could this be the CPU failing or maybe the MOBO being dysfunctional?

Specs:
CPU: i5 4670k 3.4 GhZ
Mobo: Gigabyte Z87-HD3
G.Skill Sniper 2x4GB DDR3 1866 mhz
SSD 1: Crucial M500 128GB
SSD 2: Crucial BX 100 250GB
PSU: Corsair C550M
GPU: ASUS VGA PCIe 2048MB GF-GTX760 DC2OC

Many thanks in advance.

[narzinor]

I would check the seating of the processor. Diagnosing a mobo issue is tough at times. Does it spit any error codes out from a bluescreen? You may have to get a dump file after the crash so we can see what's happening right before it crashes.

[daytonbrown]

See if it can start in safe mode or not.

[Skizofrenic]

I'll be able to check the seating off the processor as soon as I can.

Nope, no bluescreens as of yet.

- - - Updated - - -

See if it can start in safe mode or not.

Still crashes in safe mode. :/

[Tradewind]

Maybe not super helpful, but I'm leaning towards CPU/Motherboard/PSU being the culprit.

I had a similar issue with an old 2600K.

[Skizofrenic]

Is there anyway to determine which part it is? Would hate buying parts i wouldn't "need" - Budget is tight as it is.
I can probably get my hands on a PSU and test though.

All feedback is greatly appreciated.

[Deleted]

Reset the BIOS? Pull out the battery.

[Skizofrenic]

Okay, checked the CPU, it was seated just fine. Also, tried resetting BIOS and update it as well, still no dice.

[Deleted]

Ram is on xmp profile @Bios? What speeds does it run? The ram sticks are on 1st and 3rd slot (grey ones)? Have you tried flashing the mobo to a newer version?