I just built a new PC and have an issue with memory. Two sticks in channel 0 (both blue) or channel 1 (both white) cause the BIOS to sound 3 long beeps and not POST. Running one stick works fine (2GB). Running one stick in channel 0 and one in channel 1 works fine (4GB). Tried two other sticks (Kingston Value RAM) from a different working PC and got the same results.
AMD Phenom II X3 720
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL
I checked the BIOS settings for RAM, and they were correct. Is there something special I need to do to get dual channel working? Never used a Gigabyte board before.
One other fact. The CPU had bent pins which I straightened. Using just one stick, I was able to load Win7 and run everything normally, but I haven't done any stress testing. Seems like the CPU is fine.