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It is not an error to see this LED lit up; it just means that the Intel(R) Management Engine (ME) is operating. That said, it is important for there to be a supported DIMM plugged into the Channel A DIMM 0 slot for the ME to work properly...
I have tried 2 different DIMM sets. Kingston DDR2 800 sets of 2 matched 2GB chips. Any idea why they will not work, since the board supports up to 8GB of DDR2.