ASRock Z77 Extreme4 - Dual Channel not working

zenon90

Distinguished
Nov 30, 2010
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Hello there,
Few days ago, I've bought my new machine, which is Intel Core i7-3770K, MOBO as stated, 2x8GB RAM Crucial Ballistix 1600MHz, GTX 670 & BeQuiet PurePower 630W.

Everything was working fine, I mounted RAM in A2+B2 Slots to have dual channel. But then, I've put a HDD into a docking station (in my Gladius x80 case). It worked well, but when I turned off my computer and tried to turn it on again, it wouldn't load - it kept turning on and off. So I've checked this little Dr Debug diagnosis screen on MOBO and every time machine was loading, it showed a status code "0x55", which states for "Memory not installed".

So I've changed my RAM to different configurations:
Two modules in A1+B1 - NOT WORKING
Only one module in A1 slot - NOT WORKING
One module in A2 slot - NOT WORKING
One module in B1 slot - WORKING
One module in B2 slot - WORKING
Two modules in B1+B2 slot - WORKING.

Ok, that's great, but in this configuration I can't run dual channel (it has to be A1/B1 or A2/B2). Tried putting off a battery and clearing CMOS - didn't help.

So my question is, is there any chance to repair it? I probably should give back the MOBO, but the warranty procedure can last one month here, and I desperately do need a computer right now, I'm using it for video editing in my work. At last I can work on single channel mode, but of course I would prefer dual one... Thank you guys in advance for any suggestions!

And here I attach a screen from H/W Monitor - so you could check if the voltages and temperatures are OK:

fS9Ox1m.jpg