I just installed 2 - 256K RAM CHIPS in my system and I have been having problems.  Tonight, I ran the diagnostic on the system and got all kinds of error codes.  One mentioned System Memory Failure and in the message area is said "suspected memory component located on System Board at label Channel A DIMM 0.  I know it is one of the memory chips but don't know which one to return.....ANYONE --- PLEASE HELP!