For the time being, I am operating the NAS with only one hard disk. The NAS has 2x RAM slots of 1GB each. I have now ordered 1x 8GB RAM and put it in the primary slot, in the 2nd slot I have kept the 1GB. Now it is so that the NAS cannot be switched on in this combination. If I have both 1GB in it, it works. Is it necessary to have the same amount of RAM in both slots or is it possible that the 8GB is defective?