The PowerMac G5 is a desktop computer first produced in 2003 by the Apple Corporation. This guide will review the repair process of an Apple PowerMac G5 model number A1047 EMC 2061 from 2004.
It was discontinued in 2006 as part of the Intel switch first to developers then consumers.
The memory and logic board are separate. You may have bad RAM or a bad logic board. The statement from Apple seems a bit lame, what else did they tell you, was this on the phone or did you take it in? What diagnostics were done? How about telling us just what the problem is?