PowerMac G4 MDD, 1.42GHz, 10.5.8 Leopard. I'm just loading old IDE drives in it, and one I just put it isn't recognized. Spools up fine, and its not ticking like dead drives do (Like my 6GBs/500GB/7200rpm drive just did ). I have it located in the upper slot, forward (front) bay. Set in slave mode, and still not recognized.