This is an old (not just used) computer.  Mother board died.  These motherboards no longer in production so had to get a refurbished.  Two of the 4 memory slots on the 2nd did not work. Oh, btw, the battery on 2nd mother board went dead.  I thought those are supposed to last for many years.  Just waiting for the next hammer to drop.  I will not waist my time or money  with another refurbished anything again.