(if its a newbie) you got to tell them the difference between a PCI USB card and actually having USB on the motherboard itself.

If the person is a total idiot (no pun intended) on Macs or computers in general the person might think that a computer with a PCI USB card as having onboard USB.

cause if that person has a Beige G3 that came with a pre installed USB PCI card (from ebay or another 3rd party source) and you describe to the person the way to tell a new world Mac from a old world Mac via the USB method, they will think that the Beige G3 is a new world machine.

in combination with the USB method you can add that only new world Mac's are the ones with the colored cases.

i think it would be safe to say that all original G4 Macs are all new world. the only confusion would be with the G3 systems, For that you could say that all of the platinum/Beige colored Mac's are old world. and all colored cased G3 systems are new world.

i think the B&W was the only new world Mac that used the ADB port for a KB and mouse. so saying a new world Mac lacks that port would almost be useless to help describe a new world Mac from a old world Mac.

this is a great topic alk
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Beige G3 AIO:
Rev B rom, Rev 2 mobo, G3 466mhz, 448mb ram, WD 120gb HDD, Pioneer DVR-110D, ATI Radeon 7000, USB PCI, OS 9.2.2 and OS X 10.4.8