11 Replies Latest reply: Jun 21, 2012 6:15 AM by Uncle D
Marcus Bointon Level 1 (0 points)
I've got a 2008 Mac Pro (MacPro3,1) running 10.6.4 that crashes when I put it to sleep. It started a couple of weeks ago, prior to that, all worked perfectly.

The pattern is this: tell it to sleep (by front button, keyboard or menu item)
Makes usual preparing for sleep noises
Monitors go black, go onto standby
Sleep LED starts pulsing, but *the fans stay running*.
The usual click of the power relay never happens.

From this state, it won't wake up. All I can do is hold the power button in to power it off.

Normal shutdowns and reboots work fine; it's just sleep that's a problem.

I've read of other Mac Pro sleep problems, but they seem different - crash on wake, reboot on wake etc, and I'm not seeing those problems.

Any idea why this might be happening and how to fix it?

2008 Mac Pro, Mac OS X (10.6.4), Too much memory