IMac G4

Flat Panel (2002)
The 2002 iMac G4 (Flat Panel) was released on 2002 for the 15-inch and 2002 for the 17-inch.

The firmware identifiers are PowerMac4,2 (15-inch) and PowerMac4,5 (17-inch).

Operating System

 * First Release: Mac OS 9 (9.2.2) / Mac OS X 10.1 (10.1.2)
 * Latest Release: Mac OS 9 (9.2.2) / Mac OS X Tiger (10.4.11)

Flat Panel (2003)
The 2003 iMac G4 (Flat Panel) was released on 2003.

The firmware identifiers are PowerMac4,2 (15-inch) and PowerMac6,1 (17-inch).

Operating System

 * First Release: Mac OS X Jaguar (10.2.3)
 * Latest Release: Mac OS X Tiger (10.4.11) (15-inch) / Mac OS X Leopard (10.5.8) (17-inch)

USB 2.0
The USB 2.0 version of iMac G4 (Flat Panel) was released on 2003 for the 15-inch and 17-inch, while the 20-inch was released on 2003.

The firmware identifier is PowerMac6,3.

Operating System

 * First Release: (15 and 17-inch) Mac OS X Jaguar (10.2.3) / (20-inch) Mac OS X Panther (10.3.1)
 * Latest Release: Mac OS X Leopard (10.5.8)