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.
Sometimes they go out. Try plugging it directly into a couple of the usb ports on the machine to see if it works. Then into the keyboard on both ports to test those.