Dual Quad-core Mac Pro reboots from sleep

I have an idea. Since the entrée into this thread probably is having experienced this issue, let's query people we know who've purchased the new Mac Pro and see if we can find people who have not experienced this problem under the right circumstances (an overnight sleep).

The power manager reset "fix" didn't work for me, as I reported previously (nor has it for several others).

I'm not sharing folders via samba. I've not yet had graphics card freezes. I've not had a system freeze during intentional reboot.

<<And not from the terminal, but from single user mode command line.>>

Could you explain how to do this for someone new to OS X? Thanks.

John F

Hatter, thanks. I now feel suitably stupid for not searching. My bad...

John F

Same spontaneous restart issue with 24-inch iMac. 🙂

New Mac Pro with stock configuration sleeping and waking fine during the first 3 days of life.

Ditto. I've had my Mac PRo 2.8 quad for a few days with no problem. Yesterday i installed 6GB RAM from OWC to make a total of 8GB. When I hit the mouse this morning after overnight sleep, computer restarted rather than awakened. I've slept for a few seconds and woken up with no problem. I'll try some of the fixes here.

You might want to check out the "Mac Pro 2008 Reader Report":
http://www.xlr8yourmac.com

Adding memory on G5s often required one to reset pram/nvram for it to show up properly.

Add another to the list.
2.8 with stock ram

I am having the sleep - wake - reboot problem with my new 3.2GHz Mac Pro too.
Nearly every time it wakes from sleep - fans up high - no display output - reboot.
No other symptoms apparent so far. I am very pleased with the performance while it is running...

Yesterday morning I ran hardware test off the install DVD and it appeared to lock up during memory test (no response to clicking the Stop Test button). I tried this a couple of times in normal and extended test modes with the same apparent lockup.

I was suspecting the 16GB of memory (8 x 2GB) that I put in, but puzzled why it provides flawless performance under heavy memory and CPU load during normal operation (including heavy Photoshop and modo 3D content creation and rendering) if the memory is bad enough to lock up the hardware test? No indication of anything wrong at all - just amazing performance - while it is running. Even during extensive successful installs of Boot Camp, Windows XP, Final Cut Pro, Adobe CS3, MS Office, iWork and several other pro software titles. Only crashes (nearly every time) when it tries to wake from sleep.

Last night I tested with my original factory memory (2 - 1GB) and it passed the basic hardware test - but appeared to be locked up during the test and required over 30 minutes to complete for the basic test that declares an estimated 3-5 minutes. When I tried the extended test it locked up so bad after an hour that the mouse would not respond. Maybe I should have waited longer, but that seemed excessive so I aborted that test by rebooting.

Then I booted the system from the hard disk with the factory memory and the first time I tried sleeping it it rebooted on wake just like with my 16GB configuration. However, repeated sleeps after that (always with a few apps running and waiting a couple of minutes before attempting wake) it did not reboot but successfully woke up and performed fine. So I left it in sleep all night and woke it up this morning just fine. I then checked my email and a couple of web forums and tried to sleep it again. I waited a couple of minutes and on wake it rebooted. So the reboot on wake phenomenon appears to be much less repeatable with less memory (or the factory memory), but still is a problem.

Next I will try my 16GB memory in basic hardware test, but let it run all day while I am at work.

-Jeff

The only thing I saw about AHT was reporting VRAM and number of processors.

What brand/make of memory is this? possible there is something happening there.
Might want to try a Safe Boot to limit what gets loaded, and run two dozen instances of Memtest in Terminal (faster and can run more loops, smaller chunks, all concurrently).

http://docs.info.apple.com/article.html?artnum=307237

So far the SMC and PRAM treatment have seemed to work. Wakes from sleep very nicely. Man this machine is sooo quiet and puts out less heat than my liquid cooled G5 2.5 gHz.

I should add that I'm on 2 UPS probably too small for the job, but they are working.

Message was edited by: Tim3308

I would be concerned about anything under 1200VA on wake from sleep or real power outage. If they are APC and you have Windows (native) running, PowerChute is very informative. Lots of settings and readings.

As a follow-up. I reset the PRAM and then let the computer go to sleep overnight. When I came back the next morning it was definitely asleep. I then clicked the mouse, and it woke up WITHOUT restart. So, not a particularly scientific study since it seems that this problem may be intermittent anyway, but I felt it was worth reporting my observations. It's at least possible that resetting the PRAM has an impact on this problem.

I returned my Dual Quad 2.8 for a new one and the new machine has no issues (knocking on wood).