Having no RAM at all is essentially still a problem with the RAM. The computer needs it and whether there be none, or be it faulty or whatever, the motherboard is just giving you a heads up that something is wrong. Do you have another compatible set of ram anywhere that you could test, to see if maybe its the RAM?
Just read your second post. Your best bet is to try a second set if you have any. Stupid comment most likely but just make sure everything is seated right when you plug them in, and that they're in the right way. If everything is in right, as I mentioned earlier, just try reconnecting everything, just unplug and replug everything in. If you cant get anything to work, youre out of luck I would say. Something isnt working and hopefully its the RAM since you probably have the motherboard all hooked up and looking pretty.