Hi Bill, how are you waking it exactly?
What PCI cards, USB, or Firewire devices are connected?
Have you done a PRAM reset, CMD+Option+p+r...
In fact, do 3 in a row, takes a bit of time.
How to reset the SMU/PMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005) ...
Earlier G3, G4, G5 models...
Open console in Applications>Utilities, check the system log for the date/time of the last problem & the Startup right after that for clues.
click on the top line we want, Shift plus click on the bottom line we want, CMD+c to copy, then paste the text in a reply with CMD+v
A couple dozen lines should be about right, hundreds or thousands won't likely be readable.
How do you "attempt to awaken it"?
What are your System Preferences> Energy Saver> Options> Other Options set to?
Is "Restart after power failure" selected?
As for the logs, a few lines before the restart up to the last line like that I posted below:
5/8/11 7:02:44 PM com.apple.launchd (0x508780.Locum) Exited: Terminated
5/8/11 7:02:52 PM com.apple.launchd ([0x0-0x8008].com.apple.dock) Stray process with PGID equal to this dead job: PID 952 PPID 1 DashboardClient
5/8/11 7:02:53 PM [0x0-0x12012].com.hp.HPEventHandler on write, error=-1
5/8/11 7:02:53 PM loginwindow DEAD_PROCESS: 0 console
5/8/11 7:02:54 PM shutdown reboot by Chris:
5/8/11 7:02:54 PM shutdown SHUTDOWN_TIME: 1304848974 118190
5/8/11 7:02:54 PM com.apple.loginwindow Shutdown NOW!
5/8/11 7:02:54 PM com.apple.loginwindow System shutdown time has arrived
5/8/11 7:02:54 PM mDNSResponder mDNSResponder-176.3 (Jun 17 2009 18:57:52) stopping
5/8/11 7:02:54 PM com.apple.SystemStarter Stopping HP Trap Monitor
5/8/11 7:02:54 PM /usr/sbin/kdcmond dnssd_clientstub read_all(3) failed 0/28 0
5/8/11 7:02:54 PM com.apple.SystemStarter Stopping HP IO Monitor
5/8/11 7:02:54 PM mds (Error) Import: importer:0x2037200 Importer start failed for 89 (kr:268435459 (ipc/send) invalid destination port)
5/8/11 7:03:59 PM kernel Darwin Kernel Version 9.8.0: Wed Jul 15 16:57:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_PPC
Above, you can see where an issue occurred, where I forced a restart, how the system handled the restart, followed by the actual restart which is the line "5/8/11 7:03:59 PM kernel Darwin Kernel Version 9.8.0:".
Just copy and pastet he lines into a reply in this discussion.
I attempt to awaken it by hiting a key on the keyboard.
In system preferences the only thing not checked in the energy saver section is "start up automatically after power failure"
Here is the log section I have as soon as it was put to sleep and when it restarted, hope it helps.....
2013-02-17 11:21:39 -0500 com.apple.time: Next maintenance wake [Backup Interval]: <date: 0x7fabd8c26440> Sun Feb 17 11:47:54 2013 EST (approx)
2013-02-17 11:21:39 -0500 com.apple.time: Requesting maintenance wake [Backup Interval]: <date: 0x7fabd8c26440> Sun Feb 17 11:47:54 2013 EST (approx)
2013-02-17 12:57:20 -0500 bootlog: BOOT_TIME 1361123840 0
2013-02-17 12:57:48 -0500 kernel: Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
2013-02-17 12:57:48 -0500 kernel: vm_page_bootstrap: 1436045 free pages and 128627 wired pages
2013-02-17 12:57:48 -0500 kernel: kext submap [0xffffff7f80741000 - 0xffffff8000000000], kernel text [0xffffff8000200000 - 0xffffff8000741000]
2013-02-17 12:57:48 -0500 kernel: zone leak detection enabled
2013-02-17 12:57:48 -0500 kernel: standard timeslicing quantum is 10000 us
2013-02-17 12:57:48 -0500 kernel: standard background quantum is 2500 us
2013-02-17 12:57:48 -0500 kernel: mig_table_max_displ = 74
2013-02-17 12:57:48 -0500 kernel: corecrypto kext started!
I backup on an external drive but not aware of any backup software.
There were only four programs in the login items, some picture and ftp software. I am not at that computer now but can be more specific if you need it.
I had a second account previously set up so I logged into that account and put the computer to sleep. When I awakened it the same problem, it restarted and opened in the first user account. Didn't expect it to do that.
What model Mac Pro (from the Menu Bar> About This Mac> MoreInfo> System Report> Hardware Overview> Model Identifier)?
Also, what graphics card is installed?
External devices connected?
You're not alone:
When did the issue start?
After a specific update?
Model - Mac Pro 3.1
Graphic - ATI Radeon HD 2600 XT.
I disconnected all the external devices, started the computer then put it to sleep. No change, it rebooted when awakened.
I believe this started about a week ago and I can't recall anything new. No recent updates or new software programs, that's what makes this baffling.