It means the RAM in slot 3/J24 is malfunctioning, more info about you mac world help... "G4" could be anything from Power Mac G4 PCI Graphics to Mac Mini G4. -brett -------------- next part -------------- An HTML attachment was scrubbed... URL: http://listserver.themacintoshguy.com/pipermail/g4/attachments/20070128/c1a1971e/attachment-0001.html