I'm having an issue with my P8Z77-V pro. It will not post if there are DIMMs in B1 or B2. The red dram led remains lit. It works fine with A1 and A2 populated. I've already tried clear cmos. Should I bring it back to microcenter for an exchange, or is there some BIOS setting I'm not seeing that's needed to activate the other two DIMMs?
Your mobo might be perfectly fine. It seems like asus z77 problem, the same thing happens on Maximus V mobo and some ram sticks. Apparently Asus HQ is aware of it and they are working on the fix. I'm awaiting for Samsung RAM to arrive to test my maximus board For more details please this thread...
Raja@ASUS please correct me if this information is incorrect.