オリジナル投稿者： Richard Tj ,
The [http://www.forevermac.com/category/apple_mac_powermacs/mdd_g4_macs/|Power Macintosh G4 MDD] should have a PMU (CUDA) switch to the mobo that you need to depress. I suspect that the 1.8gHz caused settings to be changed in the Mac. You can always do a pram reset or pull all power for half an hour (including battery). You could start up from open firmware (cmd option o and f) on power on and once in there (grey screen with some text), type reset: nvram, hit return and it should say: Ok and then give another command prompt, then type reset: all and hit return again. Mac should then re-boot.