Boot problem, DrDebug code 3B

[MRJosh86]

Hi,

I bought an AsRock Extreme7 Gen3 last year and have been getting intermittent issues booting.

It turns on - but nothing comes on screen, i can see the POST L.E.D on the motherboard run through a bunch of figures, then gets to code 3b (or possibly its 36 - its hard to tell) and does nothing.
After a few seconds the whole system shuts down and turns back on again by itself. If i leave it like this sometimes it'll turn off and on again (repeating the same codes on the MB L.E.D - ending on 3b before restarting) and eventually either just turns off and stays off or boots into windows. But most of the time i have to manually reset the CMOS (to stop it going in a boot loop) and re-apply all my settings.

The motherboard manual say that DrDebug code 3b is: Post memory south bridge initialization started.
OR DrDebud code 36 is: CPU post memory initialization started. System management mode (SIMM) initialization

My system specs are:

i72600k,
AsRock Z68 Extreme7 Gen3,
16Gb Corsair Dominator 1866MHz,
EVGA SC Signature GTX680,
two 120GB OCZ Vertex 3's in RAID-0 (OS Win7 64bit)
and a Corsair TX850W (V2) PSU.

My initial thoughts was either a PSU or RAM problem but have changed both recently and the problem still persists.

I hope someone can help.

[- wardog -]

Hint: "b" will have five LED segments lit up. While "6" will have six LED segments lit.