When using a single pair of DIMMs they should be placed in the blue slots. It has to do with memory bus termination.
Did you use the MemOK! switch to force memory compatibility tuning when the DRAM_LED was continuously lit?
Did you use CPU-Z to verify that your DIMMs are running at 1600 MHz (DRAM Frequency 800.0 MHz)?
Ya! I did use the MEMok... didn't seem to work.
I think it did the compatibility with the black slots for some reason....
It works now, so if anyone else gets the same problem. Try using my technique, it should work afterwards