GA-X58A-UD3r post beeps problem, need help

Hi guys, i just assembled my new PC.

Core i7 930
Gigabyte GA-X58A-UD3R (rev. 2.0)
G.skill 3x2GB 1600 ram
win7 64bit

The problem is there are 2 beeps, 1 short and 1 long when POST.
According to the manual "1 long, 1 short: Memory or motherboard error"

Detail:
When i only install one 2GB ram, it gives 1 short beep, which indicate working normally, however when i install 2 set of 2GB ram, it gives 1 short and 1 long beeps. and 3x2GB have the same problem with 2x2GB

except that, everything works fine.

Any help would be very nice.

Thanks

What slots do you have your memory in?

Hi AZboomer, thanks for ur reply.

I have solved the problem, i enter the BIOS and Load Optimized Defaults, then the long beep is gone.