Is there a prevailing theory as to which early Mac Pros running Tiamo's boot.efi fail to sleep properly? In mine, for instance, pressing the power button just briefly when Mavericks is running accomplishes nothing at all. SMC and PRAM have been reset to no avail. If I choose to let the computer sleep on its own after, say, fifteen minutes of inactivity, it may turn the monitor off, but it doesn't actually go to sleep (the power button light is on all the time, with no fluctuation). Even worse, if I try to "wake it up", chances are the screen won't come back to life and I have to force the computer to shut down. The only differences I can think of between my Mac Pro 1,1->2,1 and the original model are:
1. Although it has the original internal Bluetooth card, it doesn't have a real AirPort expansion card, but a PCI card recognised as a regular AirPort card.
2. I installed Mavericks Server, but I don't usually run it.
3. Most importantly, my graphics card is an ATI Radeon HD 5770 1024 MB provided by Apple and my monitor is an Apple 27-inch LED Cinema Display.
Is there a solution to sleep/wakeup issues that is any better than not letting the computer sleep? Thanks.