Power Mac G4 power button activates sleep instead of shut down.

I am setting up my G4 as a 'backup' machine for a macbook pro. The G4 will not have a monitor attached, so I will not have access to the normal 'Apple>Shut Down' menu or key commands.
The power button on the G4 powers up the machine just fine, but pushing the power button to turn the machine off seems to put the system to sleep (including the monitor) but doesn't shut anything off.
Any ideas as to what could be causing this or how to fix it? Thanks in advance!
Message was edited by: Host <to clarify Title>

Hi, Ryan -
If you are using an Apple Pro keyboard on that machine, there is a set of keystrokes which may allow you to shut it down 'in the blind' (they work with OS 9; not sure about OSX) -
Press the key combo Option-Eject (Eject is the topmost-rightmost key above the keypad). This should bring up a splash screen displaying buttons for Restart, Sleep, Cancel, and Shutdown. As I recall, the default (heavy-border or blue) button is Shutdown - pressing Return or Enter should engage it.
Note - not sure if the modifier used with Eject is Option (I think it is) or another one... I don't have a machine available at the moment which has an Apple keyboard on it with which to test.

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Power mac G5 unexpectedly goes in sleep mode or shut down.

I have a very strange problem.
I was using my 2 year old G5 without any problem untill some weeks ago. Randomly it would go into sleep mode without any mesage, you could start it again by pressing any key. It would start working for a little while(minutes), but then it would freeze and either go in sleep mode again or eventually it would shut down (without any mesage). However the little light above the power button would stay on. If you don't touch the keyboard or computer it will try to start again by itself.
If in sleep mode it will just come back with the screens I was in or it will boot and try to go to login. I say try because sometime it will shutdown again before that.
It is not predictable when it will happen. Sometimes it doesn't happen for days and then suddenly two days in a row.
I thought it could have something to do with the power supply so I bought a ups power system, didn't help.
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Thanks for the input
I did the PMU reset, but it didn't solve the problem. Two days later my computer had a nother episode.
I checked the console.log after that and didn't find any temperature messages.
I did find this:
Feb 18 08:16:28 LeoComputer mDNSResponder: Repeated transitions for interface en1 (10.0.1.2); delaying packets by 5 seconds
Feb 18 08:16:30 LeoComputer kernel[0]: AFPSleepWakeHandler: waking up
Feb 18 08:16:30 LeoComputer kernel[0]: AFP_TCP ASP_TCP SendSleepPkt: sending ext sleep wakeup
Feb 18 08:16:32 LeoComputer kernel[0]: AFPSleepWakeHandler: going to sleep
Feb 18 08:16:32 LeoComputer kernel[0]: AFP_TCP ASP_TCP SendSleepPkt: sending ext sleep
and later:
Feb 18 08:19:19 LeoComputer mDNSResponder: Repeated transitions for interface lo0 (127.0.0.1); delaying packets by 5 seconds
Feb 18 08:19:22 LeoComputer launchd: Server 0 in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[227]: exited abnormally: Hangup
Feb 18 08:19:22 LeoComputer configd[43]: posting notification com.apple.system.config.network_change
Feb 18 08:19:22 LeoComputer lookupd[232]: lookupd (version 369.5) starting - Sun Feb 18 08:19:22 2007
Feb 18 08:19:24 LeoComputer mDNSResponder: Repeated transitions for interface en1 (10.0.1.2); delaying packets by 5 seconds
Feb 18 08:19:28 LeoComputer kernel[0]: AirPort: Link DOWN (Client disAssoc 0)
Feb 18 08:19:28 LeoComputer lookupd[235]: lookupd (version 369.5) starting - Sun Feb 18 08:19:28 2007
Feb 18 08:19:28 LeoComputer configd[43]: posting notification com.apple.system.config.network_change
Feb 18 08:19:28 LeoComputer launchd: Server c50f in bootstrap 1103 uid 0: "/usr/sbin/lookupd"[235]: exited abnormally: Hangup
Feb 18 08:19:28 LeoComputer lookupd[236]: lookupd (version 369.5) starting - Sun Feb 18 08:19:28 2007
Feb 18 08:20:19 LeoComputer kernel[0]: System Sleep
Feb 18 08:20:19 LeoComputer kernel[0]: System Wake
Feb 18 08:20:19 LeoComputer kernel[0]: Wake event 0020
Feb 18 08:20:20 LeoComputer kernel[0]: USB caused wake event (EHCI)
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My MacBook Pro will suddenly go to sleep while I am using it. Sometimes if I press any key on the keyboard it will wake back up quickly, other times I have to hold down the power button until it forces a shut down and then restart. Does anyone know why??

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Macbook pro goes sleeping instead of shutting down

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MacBook Pro won't sleep or stay shut down?

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This happens ~75% of the time:
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I have a MacBook Pro that would not work correctly with an interim OS update no matter how I approached it. The consensus on this forum was that I was doing something wrong. I reinstalled to the pre update state and waited till the next upgrade was released. When I applied this everything was fine and has remained so. Perhaps OS X 10.8.3 will offer you some relief.

IMac restarts instead of shutting down

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Laptop won't go to sleep mode and shut down properly.

hello, My name is Atul and i upgraded my laptop hp pavilion 15-p017tu from win 8.1 to win 10 on 29h july. My laptop was working great before the upgrade and before upgrading i updraded ( updated ) all the drivers and windows too. so, after the upgrade i have been facing the same problem which has been shared by many peple here..i.e win doesn't go to sleep mode. In my case when ever i put the sys to sleep mode, the screen turns off but the power button doesn't blinks and i can't go back to the normal mode by using mouse curser or pressing the power button back. I have to physically shut down the system by pressing the power button for 5 seconds. Also, my system won't shut down properly and it is the same as the sleep mode probem. I have contacted the customer care of microsoft and hp both and they did some setting changes but the problem keeps coming back. I have also told by the hp care that they will take atleast a month or two to fix this as this may be due to hardware not supporting the current driver so this might take time. They also told me to just downgrade to win 8.1 and after sometime when this poblem is fixed i can again install and upgrade win 10. If any of you guys know how to fix this problem do share it here. thanks!!

Hi ,
Thank you for visiting the HP Forums! A great place where you can find solutions for your issues with help from the community!
I came across your post about the Notebook, and wanted to assist you! I have looked into your issue about your HP Pavilion 15 p017tu Notebook and issues with the sleep mode and shut down not working correctly. Go into the Device Manger and go to display adapters. Update the driver. Select the Automatically search for updated drivers.
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Restart instead of Shut Down

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More information would be helpful. The computer is restarting instead of shutting down? What happens if you use the power button to shutdown?
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I thing is related to the outlets here in my house.
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BrettGoudy wrote:
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Power Mac G4 power button activates sleep instead of shut down.

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