I have a 15" Studio Display (ADC) connected to a G4 450DP. Since installing OS X, if the computer goes to sleep on its own after the pre-set period of inactivity, frequently I can wake the computer but not the monitor. I have to restart the computer to get the monitor to wake up. The problem occurs--less frequently--when I put the computer to sleep myself.
I've tried playing with the Energy Saver control settings, to no effect.
Anyone have any ideas about how to fix this? Thanks.