Macpro display sleeping issue

[faumble]

am having a problem with the displays going to sleep, they go to sleep but wake up on their own as soon after they sleep, I mean they stay asleep for less than a second , what could it be? this started a week ago, worked fine before... Thanks in advance!

 

[4JNA]

what have you plugged in recently? lots of usb stuff will cause this, tries to sleep, usb won't let it sleep, wakes right back up.

unplug anything usb/firewire, try to sleep and see if that fixes it. best of luck.

 

[super_kev]

If you can't nail it down, download SleepDisplay (if you're running 10.5). It's an application that will put your display(s) to sleep.

 

[shiny-blanket]

am having a problem with the displays going to sleep, they go to sleep but wake up on their own as soon after they sleep, I mean they stay asleep for less than a second , what could it be? this started a week ago, worked fine before... Thanks in advance!

Had the exact same problem with my Mac Pro, just shortly after buying an ACD. The problem? Having the usb/firewire cable plugged in (regardless of whether anything is attached to them) causes the wake from sleep issue. Only way to get around this is to unplug the cable when not in use.