P67S-C43: Won't POST with two sticks of RAM

Hi, my new P67S-C43 has a peculiar problem: It won't POST with two sticks of RAM. I've tried both of my sticks (2 x 2GB G.Skill Ripjaws DDR3-1600 CL9 1.5V) individually in Slot 1 and the system POSTs fine. When I insert the second stick in any other slot, the system proceeds to restart unsuccessully a couple of times and then it will not POST. Only one blue LED is illuminated. When the system is in this state I have to reset the CMOS in order to POST successfully with a single stick of RAM again, which made the problem difficult to diagnose and very annoying to troubleshoot (lose BIOS settings after every attempt with the clear).
Any idea of when we'll see a new BIOS? Are any betas available? I'd like to see if this is a BIOS problem before RMAing it.
Thanks.

Quote from: HU16E on 14-January-11, 16:52:36
Which BIOS do you now have? Current official is V1.5. It would possibly help to have a full listing of all the systems components. Work with the one RAM stick initially in the primary dimm slot, blue closest to CPU. Get the OS loaded, drivers, etc., then add the second stick in the other blue dimm slot later. I have a feeling the RAM is setting itself up wrong. Might try the manual settings of 1333 9 9 9 24 @ 1.50V's.
The BIOS was 1.5 out of the box but it's my understanding from another thread that there have been a slew of beta BIOSs released. I'm not going to load the OS until I get this straightened out. Also, both sticks would have the same settings with one stick or two installed. I fiddled with voltage, timings, etc but it still wouldn't work when I popped in the second stick. LIke I said, after every attempt with two sticks I have to clear CMOS or it won't work again with one stick. I'm hoping to try a newer BIOS before spending more hours on this, one setting at a time.
Also, I have a 2600K but the rest of the components are irrelevant. At one point I had everything but the CPU/fan, video card, and RAM unplugged and the mobo entirely out of the case. Still didn't work until there was only one stick.

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