Some of the Mac OS X Install Disc 1 discs that ship with iMac G5 (iSight) erroneously show Apple Hardware Test as being "AHT version 2.5.2." The actual version on these discs is version 2.5.3.
Apple Hardware Test for iMac version 2.5.3 is the correct version to use with the iMac G5 (iSight) computer, and the label is printed correctly on later shipping discs.