PowerMac running Leopard wakes up but the Apple display doesn't

I installed Leopard 10.5.1 on my old Dual G4 MDD (2x867MHZ). My monitor is an Apple Display 20". Whenever the system goes to sleep and I try to resume, the computer comes up, but not the display, which remains in suspended mode. The computer is fully functional since I can VNC into it from another Mac. I can't seem to find a solution for this problem online. I already reset the PRAM and the PMU, and I am running out of options. The computer has an airport card but no other expansion card or any attached peripherals. It used to behave properly with Tiger, therefore I think the problem seems related to the Leopard install. Any hint, or indication that this is a known issue, would be greatly appreciated.

Hi! Sleep problems are common with Leopard. I can set my monitor only to go to sleep and it may wake up fine for several days and then not. It seems worse since the 10.5.1 update. I may just use a screen saver and not let the monitor sleep. Tom

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