Q: Dual Quad-core Mac Pro reboots from sleep

Count me in, too. 2x2,8GHz with stock memory.

I wasn't able to reproduce it by repeatedly waking my MacPro from sleep. It only seems to happen after prolonged sleeps.

The snippet below shows the log messages in /var/log/system.log from a regular sleep/wake cycle. In case of reboot, even the first line is missing from the log file.

Feb 6 09:07:42 MacPro kernel[0]: System Sleep
Feb 6 19:25:12 MacPro kernel[0]: System Wake
Feb 6 19:25:12 MacPro kernel[0]: Previous Sleep Cause: 5
Feb 6 19:25:12 MacPro kernel[0]: USB caused wake event (EHCI)

I return my unit to Apple, they say I will get full refund.

My system still continues to 'wake up' properly after doing the PRAM reset. It seems, based on the discussions here, that this approach does not work for everyone; but I have to conclude that the PRAM reset is at least an effective fix for this problem in some cases. In other words, I wouldn't write it off as completely ineffective as some other posts here have suggested.

My single quad core Early 2008 Mac Pro exhibits this behavior.

SMC reset was not effective for me.

My friend has a 4x2.66 Mac Pro (prior hardware version) that exhibits similar problems. I don't know whether it's the same problem or not, but he did tell me that he never had that problem when he was running Tiger, only after upgrading to Leopard.

He's tried clean installs of Leopard from an firewire drive and had apparent success with waking until he tried to migrate his accounts. As for me, I migrated my user accounts.

Message was edited by: Dean Thompson

I'm on my 2nd and it just did the restart from sleep thing again....VERY FRUSTRATING....APPLE quality control ***** right now!

I really don't think returning the unit will help much as I'm pretty convinced it is a software problem. I still haven't seen this problem when running Vista.
I only wish users would post more useful information.

Did Apple acknowledge the issue or run you through any diagnostics? And, is it 14 days, that we have to return the unit w/o the restocking penalty?

Tom, if Vista runs OK, then it is likely a s/w bug. If folks are seeing this on iMacs, etc., then it's not platform specific but still frustrating...

Update:

The suggested SCM and PRAM fixes have worked for me...still, despite the mixed results reports here. I sleep it long every night and no wake up problems anymore, for quite awhile. 8 additional GB of 3rd party RAM, 3 added internal drives, using two UPS. Other than the initial sleep problem the machine has been flawless, but I can't say that for Leopard w/ it's updated QuickTime not playing mp4's, but iTunes does!(massive thread under that for QT, mail crashing here and there and other bugs.

Just chiming in (better late than never) that I also experience this problem on my week-old Mac Pro.

As other posters have stated, it occurs occasionally (usually longer sleeps) but not on every sleep occasion (short sleeps).

Tom ten years ago I also had thought that returning the unit is not so helpful. Today it's different, Apple seems too busy making phones and walkmanks lately, and the frequent computer bugs, are ignored looking to another place and singing la la la. A computer called Mac Pro would have pass quality controls before arriving at the client. This is still a Mac Aspirant.... and I have only 14 days for returning it.

The reader reports on the Mac Pro issues has one thing worth trying: reinstall the OS from the disk it came with, if you have not already. Seemed to clear up problems (along with SMC reset) for at least some.

Of course there are different builds probably, perhaps the image used and on disk has problems not on the DVD.

http://www.xlr8yourmac.com/systems/2008mac_proreports.html#storytop

I formatted my unit and performed a clean instal before experiencing this malady, so I am of the opinion it won't be worth the trouble. However, your results may vary.

BTW, I'm using the Apple bluetooth kb & mouse and an Apple monitor, if anyone is keeping track of common peripherals.

Chateau, how often does this happen for you? Is it possible for you to try this after turning off discoverable and the bluetooth connection entirely? I recall BT is now common to all Mac Pros which they were not before...

Twice a day. One while waking up in the morning and usually once during the course of the day, but I have my sleep setting to three hours. I'll have to bring that down considerably to be able to test changes in configuration with any accuracy, but I would imagine most here have convectional wired apple inputs. However, you may be on to something with the standard Blue Tooth...