imac I/O ports

* audio line-in

This analog line input features up to a 16-bit stereo, 44.1 kHz sampling rate.
The 3.5 mm audio input minijack accepts line-level stereo signals. You can also connect a stereo miniplug-to-RCA cable adapter to connect stereo equipment to the computer.
The iMac G5 (iSight) also has a built-in microphone near the built-in iSight camera at the top of the computer screen bezel.