The input/output ports of PowerBook G4 computers are illustrated in the following images and tables. Because port arrangement varies between PowerBook G4 models, it is necessary to know which model you have.
| Input/output ports of PowerBook G4 and PowerBook G4 (Gigabit Ethernet) computers | |
| 1 | AC power port |
| 2 | FireWire port |
| 3 | Ethernet port |
| 4 | Two USB ports |
| 5 | VGA port |
| 6 | S-video output port |
| 7 | Reset button |
| 8 | Modem port |
| 9 | Infrared port |
PowerBook G4 (DVI) and PowerBook G4 (1 GHz/867 MHz) computers

| Input/output ports of PowerBook G4 (DVI) and PowerBook G4 (1 GHz/867 MHz) computers | |
| 1 | FireWire port |
| 2 | Ethernet port |
| 3 | Two USB ports |
| 4 | DVI port |
| 5 | S-video output port |
| 6 | Audio line-in port |
| 7 | Modem port |
PowerBook G4 (12-inch) computer

| Input/output ports of PowerBook G4 (12-inch) computers | |
| 1 | AC power port |
| 2 | Modem port |
| 3 | 10/100 BASE-T Ethernet port |
| 4 | FireWire 400 port |
| 5 | Two USB 1.1 ports |
| 6 | Video output port (VGA and composite/S-video output) |
| 7 | Audio line-in port |
| 8 | Headphone sound output port |
| 9 | Security cable lock slot |
PowerBook G4 (12-inch DVI), (12-inch 1.33GHz) computers

| Input/output ports of PowerBook G4 (12-inch DVI), (12-inch 1.33GHz) computers | |
| 1 | AC power port |
| 2 | Modem port |
| 3 | 10/100 BASE-T Ethernet port |
| 4 | FireWire 400 port |
| 5 | USB 2.0 port |
| 6 | USB 2.0 port |
| 7 | Mini-DVI video port (VGA, DVI, composite/S-video output) |
| 8 | Audio line-in port |
| 9 | Headphone sound output port |
| 10 | Security cable lock slot |
PowerBook G4 (15-inch FW 800), (15-inch 1.5/1.33GHz)

| Input/output ports on the left side of PowerBook G4 (15-inch FW 800), (15-inch 1.5/1.33GHz) computers | |
| 1 | AC power port |
| 2 | Modem port |
| 3 | USB 2.0 port |
| 4 | Audio line-in port |
| 5 | Headphone sound output port |
| 6 | PC Card/CardBus slot |
| 7 | PC Card eject button |

| Input/output ports on the right side of PowerBook G4 (15-inch FW 800), (15-inch 1.5/1.33GHz) computers | |
| 1 | Security cable lock slot |
| 2 | USB 2.0 port |
| 3 | FireWire 400 port |
| 4 | FireWire 800 port |
| 5 | 10/100/1000BASE-T Ethernet port |
| 6 | S-video output port |
| 7 | DVI port |
PowerBook G4 (17-inch), (17-inch 1.33GHz), (17-inch 1.5GHz)

| Input/output ports on the left side of PowerBook G4 (17-inch), (17-inch 1.33GHz),(17-inch 1.5GHz) computers | |
| 1 | Security cable lock slot |
| 2 | AC power port |
| 3 | Modem port |
| 4 | USB port. PowerBook G4 (17-inch) computers have USB 1.1 ports. PowerBook G4 (17-inch 1.33GHz), (17-inch 1.5GHz) computers have USB 2.0 ports. |
| 5 | PC Card/CardBus slot |
| 6 | PC Card eject button |
| 7 | Audio line-in port |
| 8 | Headphone sound output port |

| Input/output ports on the right side of PowerBook G4 (15-inch FW 800), (15-inch 1.5/1.33GHz) computers | |
| 1 | USB port. PowerBook G4 (17-inch) computers have USB 1.1 ports. PowerBook G4 (17-inch 1.33GHz), (17-inch 1.5GHz) computers have USB 2.0 ports. |
| 2 | FireWire 400 port |
| 3 | FireWire 800 port |
| 4 | 10/100/1000 BASE-T Ethernet port |
| 5 | S-video output port |
| 6 | DVI port |
PowerBook G4, PowerBook G4 (Gigabit Ethernet), PowerBook G4 (DVI), and PowerBook G4 (1 GHz/867 MHz) computers
The PowerBook G4 models that have a 15-inch screen have a PC Card/CardBus slot on the left side of the computer. The PC Card slot on the PowerBook G4 (17-inch) computers is depicted in an illustration above. PowerBook G4 (12-inch) computers do not have a PC Card slot.
