If you are using PS/2 keyboard and mice you need to install proper ps/2 support. As real Apples don't have PS/2 devices you're better of using usb mice/keyboards.
For that to work you need your USB chipset to be supported, some PC USB hardware is not supported properly and you need to install a patched driver.
Most OSX installation disks come with options to install alternative USB.kexts
Trial and error basically!
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[size="1"]Apple G4 1.2Ghz 1Gb, DAudio, Ati 6800Pro (AGP), OS 10.4.11/10.5.2, OS 9.2, Linux PPC
Macmini G4 1.2Ghz, 512Mb, OS 10.4.11,
iMac Snow Graphite G3 600Mhz, 512Mb, OS 10.3.9, OS 9.2
Dell Optixplex GX270 2.2Ghz SSE2, 5200 Nvidia/6250Nvidia, 1.6Gb, 100Gb HD OSX Tiger 10.4.11
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