Won't shut down or reboot after Snow Leopard install

Have you tried repairing permissions with Applications -> Utilities -> Disk Utility?

I'm having the same problem. After installing Snow Leopard on Black Macbook (below), each restart freezes with desktop picture only showing. Hard shutdown followed by startup brings the system back up and it appears to work fine until the next need for a restart. Peripherals and drivers all appear to be compatible. Repairing disk permissions didn't help. HD checks out OK. Guess I won't worry about it as long as the problem is restricted to startups/restarts; wait for Apple to fix it.

Model Name: MacBook
Model Identifier: MacBook4,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 2 GB
Bus Speed: 800 MHz
Boot ROM Version: MB41.00C1.B00
SMC Version (system): 1.31f0
Serial Number (system): W8 ***A0P2 <Edited by Host>
Hardware UUID: B1BE1EA9-6342-5EB2-A43E-E5C258AA532D
Sudden Motion Sensor:
State: Enabled

Please start a new thread Joe here:
http://discussions.apple.com/forum.jspa?forumID=1337&start=0

You'll get a wider audience, and won't confuse the original poster with solutions that don't apply to tehm.

By the way, your serial number says your Mac is from the 21st week of 2008,
which is May 20, 2008. This puts it as this model here:

http://www.everymac.com/systems/apple/macbook/stats/macbook-core-2-duo-2.4-black -13-early-2008-penryn-specs.html

No need to repost your serial number. Better to post the above link.

G'day,

I have a few suggestions:

1) Try a Safe Boot (which loads fewer extensions), and see if it shuts down.
2) Look in "Console" (system or all messages) for any errors that are written during shutdown.
3) Try reinstalling Snow Leopard (in place - this has helped others)

Cheers,

rodney

Hi,

I have a very similar problem with a 2006 white iMac, tiger and leopard both ran fine, though after the install of Snow Leopard it just will not shut down, blue screen comes up and the little circle goes around then that stops and it just hangs on the blue screen. If you get an suggestions as to how to resolve this I would love to hear them also.

Thanks

Similar Problem on a MacBook. Sometimes it hangs on the blue screen. Other times it shuts down, then does an instant restart. (as if I chose restart instead of shutdown) The fan runs at high speed the entire time it is "down" unless I open the laptop up and start using then I get normal fan operation again.

Also, it is constantly trying to "eject" the superdrive that has nothing in it. Until again that is, I actually log in and use the machine.

It WILL NOT turn off at all, even holding down the power button.

Very strange.

UPDATE:

Do you have Elgato's Eye TV installed? Go to Utilities->Console and look at the "all messages" section. There you will see the reawake events. Console will tell you what app is causing SL to keep waking up. Then go from there. (my case was Eye TV - still no solution yet, but I know the culprit)

You could make a bootable clone of your bad install on an external. Then, start up to your DVD and do a clean install. Afterwards, if the install works properly, then you could reclaim your data from the clone. Also, you probably could reclaim your apps. But, I would not reclaim your user account or your settings.

You also could do things the opposite way, doing the fresh installation on the external and proceeding the obvious way from there.

Message was edited by: donv (The Ghost)

I'm having a similar problem with my 2006 Intel iMac. I had no issues installing Snow Leopard, and no issues upgrading to 10.6.1. The iMac restarts just fine but it won't shut down - the shut down command just restarts it. Even holding down the power button seems to start the shut down process, but then it goes into restart. I only noticed the problem after the 10.6.1 upgrade, but it may have been present after the 10.6 upgrade and I just never tried to shut it down. I'm having none of the blue screen or spinning beach ball issues others are having. It was fine before Snow Leopard.

Having the same problem, but I have found a small workaround.

I can shut down via the login window. When I try to shut down there, I'm told that someone else is logged in -- not true. But if I enter my name and password as the admin, I can shut down without using the power button.

I have repaired permissions a few times, but the problem persists.

hello
i found out what to do in order to get rid of that annoying problem :
just go to Macintosh HD > Library > Preferences > System Configuration > and delete the files named Com.apple.autowake.plist and com.apple.powermanagement.plist. erase those files, reboot the mac and you should be good to go! you might have to redo your energy saving preferences again, but it's no biggie

Note : you wont find the 'system Configuration' file in preferences if you go through User > Library > preferences, so do go through your mac HD instead!

enjoy!

I am having the same problem, 2009 Mac Pro, 10.6.2, blue screen every shutdown or restart, whether from the login screen or from my user account. What the ****?

How do you fix this? I updated everything to Snow Leopard versions. I tried your suggestion deleting prefs files, but didn't help.

I've done everything above now, and no fixes... any other bright ideas? I reinstalled OS X like Applecare said and it did not move my previous system or anything... Just installed right on top of it... Fixed nothing.

Thanks for the excellent advice. I removed the com.apple.powermanagement.plist file and my mac now shuts down fine.