Target disk won't mount on iMac

Hi,

Please provide details about the exact iMac models/years as well as the exact Mac operating system versions.

https://everymac.com/systems/apple/imac/index-imac.html

This is the iMac (PPC) forum. Normally, for PowerPC models, one would use a FireWire connection.

Later models with other processors could use USB, USB-C or Thunderbolt.

Transfer files between two Mac computers using target disk mode – Apple Support (UK)

I don't remember Target Disk Mode ever supporting Ethernet or Wi-Fi connections.

FYI: PPC or PowerPC are older than 2006. Are these that old?