Macbook won't shutdown/restart on command

Hi, I'm a graphic design student and I use Adobe products on my book.
After I use adobe illustrator or really any program for a while, my macbook wont restart after I'm done.
Even if I close the program and dont use anything on the computer then try to restart , it won't. It's like theres a point of no return. I feel maybe there's virtual memory build up perhaps? Also my google notifier stopped working, and never works now. This happened around the same time my computer stopped restarting/shutting down on command... but it might have nothing to do with it.
Also when I hit restart, it ll tell me something is open like ichat or itunes, when it's obviously not and isn't an option on the forced quit menu.
Please help, my macbook is getting screwy and I'm worried.
also my airport drops the connection even though it shows a strong signal (but it seems like thats happening to everyone)

Try resetting your SMC and resetting your PRAM.
Resetting the System Management Controller >>
If that doesn't work, do an Archive and install to eliminate a software issue.
Mac OS X: About the Archive and Install feature >>
-Bmer
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Similar Messages

I messed up badly by trying to restore my brand new macbook pro by doing restart then command R and choose disc utility repair now when I start ,all I get is the white screen with a folder and a question mark,What can I do???help please

I messed up badly by trying to restore my brand new macbook pro by doing restart then command R and choose disc utility repair now when I start ,all I get is the white screen with a folder and a question mark,What can I do???help please

Can you still boot to the Recovery partition using Command and R whilst booting? Or did you wipe the Recovery partition as well?
If your Recovery partition is still intact, you can simply boot to it and reinstall the OS via the Internet. If you wiped the Recovery partition, you can hold down Command, option and R keys whilst booting and boot into true Internet Recovery mode. You'll be able to reformat the hard drive, erasing all partitions (format it as "Mac OS Extended (Journaled)" with a dingle GUID partition) and then reinstall the OS that shipped with your machine.
Note that you should use a physical Ethernet connection when restoring over the Internet - it's three times slower if you use wifi.
Try your Recovery partition first and if that doesn't work, use Internet Recovery.
Clinton

MacBook will not Shutdown, Restart, or Logout after 10.5.7 update

Ive been having this problem for weeks now, and have been unable to find anything to fix this issue.
My MacBook will no longer restart/shutdown/logout from the apple menu. it also does nothing when i press the power button to try and get the options to come up. nothing happens when i choose the options from the apple menu. no error or time out messages or anything like that. the only way i can get my mac to shutdown is to either do a hard restart or by using the shutdown command in terminal.
i have tried running disk utility, repairing permissions, running onyx, downloading the 10.5.7 combo update from apple, resetting the pram, etc etc. but nothing has changed.
all of my programs, etc. are working fine. and everything else about my mac seems completely normal except for this.
i forgot to add that sleep mode does work from the apple menu. nothing else though.
ive read that a lot of people are having some bad issues with the 10.5.7 update.
please help. im stuck!

This is what shows up in console: (maybe someone who can understand this can help us!)
15.05.09 16:38:26 Mail[1478] GET /internetservices/issupport/1_27a4cv2b6061/clientConfig.plist (FAILED), httpStatusCode:-1, errorType:100 (domain=NSPOSIXErrorDomain, code=1), transactionState:5, txnId:2F42C0AC-8189-4309-B914-AB3759688961, auto-retries=2, manual-retries=0
15.05.09 16:38:26 Mail[1478] GET /internetservices/issupport/1_27a4cv2b6061/clientConfig.plist (FAILED), httpStatusCode:-1, errorType:100 (domain=NSPOSIXErrorDomain, code=1), transactionState:5, txnId:DD2C955C-DAD7-4CAF-BFD7-79B75F6C93E0, auto-retries=2, manual-retries=0
15.05.09 16:38:27 Mail[1478] POST /Info.woa/wa/XMLRPC/accountInfo (FAILED), httpStatusCode:-1, errorType:100 (domain=NSPOSIXErrorDomain, code=1), transactionState:5, txnId:D4B63982-058D-4AF4-ADBB-CF84E9DDE8EF, auto-retries=2, manual-retries=0
15.05.09 16:39:32 Mail[1485] GET /internetservices/issupport/1_27a4cv2b6061/clientConfig.plist (FAILED), httpStatusCode:-1, errorType:100 (domain=NSPOSIXErrorDomain, code=1), transactionState:5, txnId:13DE143D-0FE5-443B-834E-253082F0E448, auto-retries=2, manual-retries=0
15.05.09 16:39:32 Mail[1485] GET /internetservices/issupport/1_27a4cv2b6061/clientConfig.plist (FAILED), httpStatusCode:-1, errorType:100 (domain=NSPOSIXErrorDomain, code=1), transactionState:5, txnId:EAE08B1B-6DEE-459B-8903-0E4700B3087B, auto-retries=2, manual-retries=0
15.05.09 16:39:32 Mail[1485] POST /Info.woa/wa/XMLRPC/accountInfo (FAILED), httpStatusCode:-1, errorType:100 (domain=NSPOSIXErrorDomain, code=1), transactionState:5, txnId:ABEB15F4-5650-4230-BDA8-ED1512B59443, auto-retries=2, manual-retries=0

MacBook Pro won't shutdown or restart properly

I am having difficulty shutting down or restarting my core 2 duo macbookpro. When trying to shutdown or restart normally (either by clicking on the blue apple logo on the menu bar and clicking shutdown/restart or by tapping the power button and clicking shutdown/restart), OSX closes all running programs, everything (icons, menubar, dock, etc) disappears except for the wallpaper, and then the screen turns a little dim like the mac is about to shutdown and the little circle (progress) shows it's running. So far everything is completely normal. the problem is that it stays that way and never restarts or shuts down. eventually, i have to restart manually by holding down the power button. I've waited for long periods of time - nothing happens.
moreover, I have to say that this is not after I've installed anything. it's just the way it is & this laptop is completely new.
ANY type of help or solution would be great.
Thanks.

Sounds like you've got an application hanging on shutdown.
Try this:
Close all applications. Open Activity Monitor in Applications>Utilities. Have only "My Processes" showing. Sort them by name. Do you see any addons or extra applications you've installed in this list? If so, end the process. If you see something you don't recognize at all, ask about it. Once you've killed all the processes related to addons, try shutting down the computer.
~Lyssa

Won't shutdown or restart unless hard boot - SMCFanControl Application

I have quite a bit of installed hardware so I thought SMCFanControl would be a good idea. However, it seems that I can reproduce a problem I'm having when utilizing the SMC app.
Problem:
1. Won't shutdown or restart unless a power boot is performed
2. Many applications lock up and won't even force quit.
3. Can't reboot locked apps after force quitting when I re-click in dock.
Noticed:
I don't seem to have a problem unless I've at some point started ( or even after I've manually quit ) SMCFanControl. BTW I don't have it to start on login. But once I've used SMC after booting, no matter what, that is when the issues seem to begin. So I tried quitting prior to shutdown. Didn't work.
Question: Has anyone else experienced unexplained lock ups, non forceable quits on apps, no shutdown or startup without boot, whom also has SMCFanControl? Has anyone found a solution to this problem as I REALLY NEED some sort of cooling mechanism. Because without SMC, I'm running about 150 farrenheit and I can't get the room any colder without locking up myself!
P.S. I've tried resetting the PRAM or VRam or whatever Ram is reset when you power up, holding the power button in while then pushing Command, Alt, "R" at the same time until it does that long beep.
The only solution found so far is unnacceptable, which is leaving SMC turned off permanently.
Thanks,
Videoguy_511

Well Bababooey if you're comparing yourself to a Apple Genius Bar then you should already know my answer, your snarky remark get a snarky reply. Why would I go to a salesperson to fix my computer problem when I can go directly go to the source itself. I used to sell Apple computers over 8 years ago and was apple certified before the Genius bar existed. If I am to go about fixing an issue I can't fix on my own I will go to the source itself meaning Apple's programmers and developers - being UI UX Developer myself I know they should have QA'd all platforms and troubleshooted any arising issues.
This was also the first time in the 20 years I've been using a Mac that I even attempted to go on this forum which i thought would put me in connection with a certified Apple representative. This turned out to be a complete waste of time just being a public forum with no Apple employee involved. I was hoping to find a quick fix but in turn I was only frustrated with stupid responses such as yours that were in no way an answer to my original question.
BTW I fixed the issue on my own and without your help or Apples help. I'm glad if all forums point here regarding this issue because I now have the answer. The answer I was looking for from someone earlier was as simple as this {Download Maverick and reinstall the platform - it will take an hour to do but afterward 10.9.2 was installed and my computer is now able to shutdown and restart without having to do a hard boot.} No more software update bar at top and no problems with my drive which I told both you and Grant - I know my computer better than you and I've probably been using them longer than you.
So again Babowa you were so wrong...... and I am right.
Again anyone having the same problem, I suggest reinstalling Maverick and you'll be suprised 10.9.2 will work fine.

HT1557 10.9.2 update won't update on my imac 2010 at all, and now my computer won't shutdown or restart without a hard boot. Did anyone have this same problem and figure out how to fix it?

So for the past few weeks I've been trying to update the 10.9.2 update on my imac (2010 - 21.5 inch) and when I attempt to try to update the software my screen goes grey with a Software Updater top bar the shows up on the top of the grey screen and then just quits doing anything (except the screen saver which works after nothing else happens - and that shows you how long I've been waiting for the grey screen to magically do something. I've attempted downloading the software update then installing it but the same thing happens. I don't think any of my 3rd party software is the cause of this and i'd rather not uninstall the programs since the update won't even do anything. Utility is telling me nothing but the usual ARD element unable to be modified.
With the several failed attempts at installing this update (probably around 15x) my computer will not shutdown nor restart on command anymore. The only way I can shut it down is holding the power button.
I used to have so much faith in Apple products and used to be a devoted user, but since Jobs passed away the direction of Apple has gone down the toilet.

Well Bababooey if you're comparing yourself to a Apple Genius Bar then you should already know my answer, your snarky remark get a snarky reply. Why would I go to a salesperson to fix my computer problem when I can go directly go to the source itself. I used to sell Apple computers over 8 years ago and was apple certified before the Genius bar existed. If I am to go about fixing an issue I can't fix on my own I will go to the source itself meaning Apple's programmers and developers - being UI UX Developer myself I know they should have QA'd all platforms and troubleshooted any arising issues.
This was also the first time in the 20 years I've been using a Mac that I even attempted to go on this forum which i thought would put me in connection with a certified Apple representative. This turned out to be a complete waste of time just being a public forum with no Apple employee involved. I was hoping to find a quick fix but in turn I was only frustrated with stupid responses such as yours that were in no way an answer to my original question.
BTW I fixed the issue on my own and without your help or Apples help. I'm glad if all forums point here regarding this issue because I now have the answer. The answer I was looking for from someone earlier was as simple as this {Download Maverick and reinstall the platform - it will take an hour to do but afterward 10.9.2 was installed and my computer is now able to shutdown and restart without having to do a hard boot.} No more software update bar at top and no problems with my drive which I told both you and Grant - I know my computer better than you and I've probably been using them longer than you.
So again Babowa you were so wrong...... and I am right.
Again anyone having the same problem, I suggest reinstalling Maverick and you'll be suprised 10.9.2 will work fine.

Mavericks 10.9.1 won't shutdown or restart

Just upgraded to 10.9.1 Mavericks. Since upgrading, my MacBook Pro won't shutdown or restart; nothing happens after instigating, then after a few minutes a dialogue box appears saying an open application prevented the action.
I have tried to upgrade to 10.9.2 via the App Store but it requires a restart to complete... Same with using the direct downoad link from the Apple site. No external drives or peripherals attached via USB or Firewire. In order to shutdown I have to force it by holding down the power button. Otherwise the system is functioning fine.
Any ideas? If you need system logs just point me in the right direction...
Cheers guys

It appears there was some element of Chrome or Mail which was preventing the shutdown/restart sequence. Looks like I've fixed it by searching for Mail processes in Activity Monitor and force quitting those, and trashing Chrome (also using AppTrap to delete the prefs too) and reinstalling Chrome.
Just in case anyone else has this problem when upgrading to Mavericks.

MacBook Late 2008 (Unibody Aluminum) running Lion cannot shutdown, restart, or logout

After upgrading to mac os x lion, my macbook has not been able to restart or shutdown or even logout properly. This problem was not present when the laptop was in snow leopard. Currently, I am able to do a shutdown through the terminal by using the command:
sudo shutdown -h now
or restart by using the command:
sudo shutdown -r -h now
This is fine for most situations but when I am trying to install an update or a program that needs a restart, I am unable to do so. When still at the login screen, I am able to shutdown properly leading me to think that a process is preventing shutdown but I can't find anything in the console. The power button also becomes unresponsive (normally pressing it brings up the window asking whether to shutdown, restart, etc.) and can only be used to do a forced shutdown (i.e. holding it down for 10 seconds). The sleep, restart, and shutdown functions in the apple menu also do not work.
Any ideas anyone?

After upgrading to mac os x lion, my macbook has not been able to restart or shutdown or even logout properly. This problem was not present when the laptop was in snow leopard. Currently, I am able to do a shutdown through the terminal by using the command:
sudo shutdown -h now
or restart by using the command:
sudo shutdown -r -h now
This is fine for most situations but when I am trying to install an update or a program that needs a restart, I am unable to do so. When still at the login screen, I am able to shutdown properly leading me to think that a process is preventing shutdown but I can't find anything in the console. The power button also becomes unresponsive (normally pressing it brings up the window asking whether to shutdown, restart, etc.) and can only be used to do a forced shutdown (i.e. holding it down for 10 seconds). The sleep, restart, and shutdown functions in the apple menu also do not work.
Any ideas anyone?

Macbook won't restart while updating 10.6.0 - 10.6.8

Hello all,
I'm having trouble updating my Macbook Pro 13 inch from 2009.
Yesterday I turned my Macbook Pro on for the first time in 2 years and I want to bring some life in it.
It still had the version 10.5.8 which I updated with a usb to 10.6.
Now I want to update my OS X version from 10.6.0 to 10.6.8. I've downloaded the files by clicking on ''software update'' through ''about my mac''.
It now asks for a reboot, so it will install the updates. However, the macbook won't restart.
I click on restart and all it does is show very short a blue screen and then I see my background with only my mouse cursor which I can still move around. All of the applications and toolbars are gone and I can wait an hour and it will still be in the same position. So I have to force the shutdown by holding the power button... And when I turn it back on, it didn't install anything.
Can someone please help me out?
Kind regards!

Edit

Macbook won't restart after Safari 3.1 upgrade

I followed the prompts to install the Safari 3.1 update yesterday. Now my MacBook won't restart ... the spinning gear spins forever, even when I try to start in safe mode. (I was really patient, but after 7 hours it's probably not just checking directories.) Single-user mode boot also fails. How screwed am I? And I don't even use Safari!

It sounds like there is directory corruption. Might have been present before the Safari 3.1 upgrade. However, the upgrade, which updates the WebKit files, may have triggered the corruption.
Logical next step would be to Archive and Install the Operating System. If you have Disk Warrior, then I'd try that first - it's quite the marvel for fixing directory problems not recognized by Apple's Disk Utility. If you are not familiar with the Archive process, another suggestion would be to bring your machine to an Apple Store>Genius Bar, if there is one in your area, or to a certified Apple Tech.

My macbook won't start up i have used the option command p r while holding down power button but not done.. please help guys

my macbook won't start up i have used the option command p r while holding down power button but not done.. please help guys

It not polite to repost asking fro more help three minutes after initial post.
Recovery mode is Command & R keys after depressing and releasing the Power button for a normal startup.
OS X: About OS X Recovery - Apple Support
That only works for Lion and later.
What exactly happens when your try to boot to Recovery?
Try starting in Safe Mode resetting the SMC and NVRAM/PRAM
OS X: What is Safe Boot, Safe Mode?
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
What model MacBook Pro and what OSX version was on the Mac?
Have you tried booting from an OSX install DVD?
When you try to start doe the Power light light?
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

MBP 2 won't sleep manually, w/closed lid and hangs on shutdown/restart

So basically, when I'm done using it I have to hard shutdown.
I have-
zapped PRAM
reset SMC
trashed those pref files
fixed/check permissions & the disk
This thing in like 2 weeks old less than 10 hours of use for peep's sake! I bought this MBP2 to be my backup so I can take my G5 dual core in to get fixed so now that will have to wait.

Meaning MacMall doesn't accept returns on Apple products. If it has a problem, like mine, you have to go to Apple to get it fixed. You can't send it back for a new one.
Update- I just erased and installed and the problems are still there. It won't sleep manually, (will by itself but then screen won't wake) it won't shutdown and it hangs at restart. Hard reboot is my only option right now because no one here seems to have a solution so I guess I'm calling Apple.

Macbook won't get past the grey start up screen

I purchased my Macbook in 2008, roughly July.
My fiance unknowingly shut down my macbook in the middle of start up. Before that it was running perfectly fine, I had no issues.
After my fiance stopped the start up, the macbook won't turn on. It'll load up to the grey loading screen (example here)... It doesn't make much noise as it starts up either. I have all original discs that came with the macbook, if that helps any.
I'm frustrated, as I can't afford to replace my mac at this point.
Any idea what I can do?
Thanks..

Hopefully, nothing permanent. Do the following:
If you have Snow Leopard installed:
Reinstall Snow Leopard without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer. Proceed with reinstalling OS X. Note that the Snow Leopard installer will not erase your drive or disturb your files. After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Combo Updater for the version you prefer from support.apple.com/downloads/.
If you have Lion installed:
Reinstalling Lion Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion and click on the Continue button.
Note: You can also re-download the Lion installer by opening the App Store application. Hold down the OPTION key and click on the Purchases icon in the toolbar. You should now see an active Install button to the right of your Lion purchase entry. There are situations in which this will not work. For example, if you are already booted into the Lion you originally purchased with your Apple ID or if an instance of the Lion installer is located anywhere on your computer.
If you have Leopard installed:
How to Perform an Archive and Install
An Archive and Install will NOT erase your hard drive, but you must have sufficient free space for a second OS X installation which could be from 3-9 GBs depending upon the version of OS X and selected installation options. The free space requirement is over and above normal free space requirements which should be at least 6-10 GBs. Read all the linked references carefully before proceeding.
1. Be sure to use Disk Utility first to repair the disk before performing the Archive and Install.
Repairing the Hard Drive and Permissions
Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger, Leopard or Snow Leopard.) After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list. In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive. If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer. Now restart normally.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Do not proceed with an Archive and Install if DU reports errors it cannot fix. In that case use Disk Warrior and/or TechTool Pro to repair the hard drive. If neither can repair the drive, then you will have to erase the drive and reinstall from scratch.
3. Boot from your OS X Installer disc. After the installer loads select your language and click on the Continue button. When you reach the screen to select a destination drive click once on the destination drive then click on the Option button. Select the Archive and Install option. You have an option to preserve users and network preferences. Only select this option if you are sure you have no corrupted files in your user accounts. Otherwise leave this option unchecked. Click on the OK button and continue with the OS X Installation.
4. Upon completion of the Archive and Install you will have a Previous System Folder in the root directory. You should retain the PSF until you are sure you do not need to manually transfer any items from the PSF to your newly installed system.
5. After moving any items you want to keep from the PSF you should delete it. You can back it up if you prefer, but you must delete it from the hard drive.
6. You can now download a Combo Updater directly from Apple's download site to update your new system to the desired version as well as install any security or other updates. You can also do this using Software Update.

Macbook won't start

Macbook won't start up. Sounds like disc drive is spinning but screen remains dark as though startup file is not booting.

Did you also try reset of NVRAM/PRAM?
http://support.apple.com/kb/HT1379
When you tried the Command + Opt + P + R keys on restart, held almost
immediately and through the time period it should chime on startup, did
you keep holding those keys down, so as to force it to repeat the chime?
You should do this (if possible to tell) through Three chimes, before you
let those keys go; that would be indicative of a NVRAM/PRAM reset.
Aside from the details and troubleshooting processes in the SMC reset
article from Apple Support, that could shed some light on the issue, if
these were done in their subscribed order before finally trying the SMC.
Have you tried System Management Controller (SMC) reset more than once?
http://support.apple.com/kb/HT3964 {and those other troubleshooting bits}
Depending on which MacBook you have, the details may vary; with some
you could try several items not possible with a later model, such as a hard
reset of the computer (remove battery, hold power button, etc) and other
details I am not going into now... Here's something that worked for this one:
•My MacBook won't boot, no start chime, just DVD spinning sound:
http://www.ifixit.com/Answers/View/6271/My+MacBook+won%27t+boot,+no+start+chime, +just+the+DVD+spinning+sound.
There are some ideas there which may help. At least as far as trouble-
shooting. If you have access to an Apple Store with Genius Bar in the
USA or Canada, you could call ahead for an appointment to have one
of their staff genius tech persons diagnose and troubleshoot this issue.
In other locations, there may be fees charged to accommodate services.
Anyway, I an not certain what to suggest next.
Did you try booting from the Snow Leopard DVD?
Good luck & happy computing!

After installing latest update Macbook won't start up.

After installing the latest update my macbook won't start up. Instead of the login screen I get a flashing map icon with a question mark. My uncle says that means it can't find the startup disk and I had to startup from the install disk holding C but it didn't work. I'm quite desperate because I need my macbook for school (writing & producing music). I type this on a friend's computer... How can I fix this? Or do I really have to go to a mac store and part from my macbook for an unknown time...? :'(
I don't exactly know what version I have (can't check it now either) but it's at least 10.6.something and I always install the updates...

Hi
Anything unusual happen during the 10.5.3 update installation phase?
What type of iMac are you using? Your tag says G5 but also Intel core processors - it can't be both.
Try this:
-First unplug your computer and wait 10 minutes
-Next, simultaneously reinsert the power cord while pressing the power button for 5 seconds then release
-Press the power button again to start the computer - this resets the computer's system management unit (SMU) which controls your machines power functions.
-Next, press/hold down the P/R/option/command keys for 3 Apple chimes. This clears the machine's PRAM. After the 3rd chime release those keys and immediately hold down the Shift key to put the machine into Safe User Mode
-If you get to a log-in screen (may take several minutes as repair functions are occurring on the boot), log-in. When the login is complete, restart the computer as usual.
If no go, I suggest taking the machine to a certified Apple tech, or if you live near an Apple store to the Genius Bar.
Post back
Message was edited by: Hawaiian_Starman

Macbook won't shutdown/restart on command

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