Why is my computer powering up automatically after shut-down?

My Power Mac G4 has mysteriously started to power up in the middle of the night and I can't figure out why? I am on high speed cable hook up and don't recall changing strat up functions. Any advice?

Hi, SoCal -
Resetting PRAM used to be (and sometimes still is, by "old-timers") called 'zapping' the PRAM. In olden times, like back in Mac Plus days, it was necessary to remove the battery to do it. In more modern machines it can be done via the startup keyboard command key combination of Command-Option-P-R.
PRAM retains various settings used by the Mac during startup - what monitor settings to use, clock info (time and date references), what boot volume and OS to use, and several other things. Sometimes PRAM values can get contaminated, damaged, or confused - and the Mac does not behave like it should.
Resetting PRAM reverts the settings in PRAM to default (factory original) settings. Doing this can clear whatever data corruption there may be in PRAM, forces the Mac to review what hardware is available and other configuration items, and, depending on model may (sometimes temporarily) reset some user settings (like date and time) to default values.
This can often cure some issues related to booting or resulting from changes in hardware.
There's a bit more info on that here -
Article #2238 - How to Reset PRAM and NVRAM

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Why does bookmarks disappear in menu bar after shutting down?, Why does bookmarks disappear in menu bar after shutting down?, Why does bookmarks disappear in menu bar after shutting down?

Why does bookmarks in menu bar disappear after shutting down and turning mac on?

When I am in "COLLECTIONS AND BOOKMARKS" view, I changed the name of the folder that is listed under "bookmarks" (that is designed to be a drop-down menu on the Bookmark Bar), I changed the name to "TV 1" from "TV Shows". I also added another folder under the Bookmarks called "TV 2" and I dragged and dropped two bookmarks from the "Bookmarks Menu" listing to the "TV 2" folder, and yet Safari would not update in real-time the Bookmark Bar to recognize that I created a "TV 2" folder/drop-down menu, nor did it update the contents of "TV Shows" to become "TV 1".
The only way I was able to update the drop-down menu bookmark folders on the Bookmark Bar was to drag-and-drop them one at a time from the "COLLECTIONS and BOOKMARKS" view.
Is it just me or is this a ******** way of updating bookmarks?
I think it is perfectly fine as being ONE WAY of updating bookmarks, but there really should be "real-time" updating of bookmarks. That is to say, I should be able to choose "bookmark this page" and add it to the folder named "TV Shows" and automatically see Safari update it without having to make two steps: 1) choosing the bookmark, and 2) going into the list of bookmarks to manually drag and drop the bookmark into the Bookmark Bar that contains the folder/drop-down menu.

Combo restarts automatically after shutting down

Hi , I have a psu of 350 (Antec) a P4 3400 Prescott with 512DDR2. with vga ATI x300
Overload Protection
Latching Protection
+5V @ +3.3V @ +12V @
cpu temp: 42 case temp: 42
and everytime I shut down: my puter restarts automatically, it is terrible
what do I have to do ?????
then when it finally shuts down, when I restart I have to press 3 times the reset button to actually boot normally...
I tried the bios, management options,....
I would be eternally greatful
Opt.

ok, I see, it doesn't matter if it is antec or whatever psu as long as it is +400W with decent V12.
If I knew that before, I would have purchased the sonata with my own chosen psu.
now I will have a good 350W antec psu for nothing.......
I will purchase a new psu, some you guys are mentionning (thanx a lot guys )
I will give my whole computer to the shop, they will remove the mobo , replace it with new one (they just called me) and if the problem persists,...welcome antec full power....
I cannot do another thing than this. I don't want to blow my pc. it is running perfect except of that , except the reboots and won't starts....:D
thanx again. I was thinking if I had a neon light I would be in a discotheque with the reboots....could win some money if I asked for it....spooky:D
Opt.

After installing Snow Leopard, Reboots automatically after Shut Down

After I installed Snow Leopard, my Macbook Pro restarts itself after I shut it down. This doesn't happen when I shut down from boot camp though. Here's the console log of the last few minutes leading up to shut down:
9/8/09 6:17:36 PM [0x0-0x17017].org.mozilla.firefox[243] Debugger() was called!
9/8/09 6:17:57 PM Notify[222] Gmail Refresh Done.
9/8/09 6:18:45 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:18:53 PM [0x0-0x16016].com.adiumX.adiumX[241] Installing SkypePlugin
9/8/09 6:18:53 PM [0x0-0x16016].com.adiumX.adiumX[241] is LibpurpleLoaded? yes
9/8/09 6:18:53 PM [0x0-0x16016].com.adiumX.adiumX[241] Calling purpleinit_skypeplugin()
9/8/09 6:18:53 PM [0x0-0x16016].com.adiumX.adiumX[241] Initialising PurpleSkypeService
9/8/09 6:18:58 PM DashboardClient[328] com.mindquirk.widget.harmonic: NO new song!
9/8/09 6:18:58 PM com.apple.Dock.agent[169] 2009-09-08 18:18:58.386 DashboardClient[328:a03] com.mindquirk.widget.harmonic: NO new song!
9/8/09 6:18:58 PM DashboardClient[328] com.mindquirk.widget.harmonic: iTunes is Closed
9/8/09 6:18:58 PM com.apple.Dock.agent[169] 2009-09-08 18:18:58.397 DashboardClient[328:a03] com.mindquirk.widget.harmonic: iTunes is Closed
9/8/09 6:19:09 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:09 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:16 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:16 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:19 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:19 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:23 PM Quicksilver[219] * WARNING: Method selectRow:byExtendingSelection: in class SFTableView is deprecated. It will be removed in a future release and should no longer be used.
9/8/09 6:19:42 PM com.apple.launchd.peruser.501[165] ([0x0-0x36036].com.apple.Console[644]) Exited: Killed
9/8/09 6:19:42 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:42 PM Notify[222] * -[NSCFArray objectAtIndex:]: index (0) beyond bounds (0)
9/8/09 6:19:42 PM com.apple.launchd.peruser.501[165] ([0x0-0x35035].com.apple.systemevents[641]) Exited: Killed
9/8/09 6:19:42 PM com.apple.Dock.agent[169] file:///Library/Widgets/iTunes.wdgt/iTunes.js:475: JS ERROR: TypeError: Result of expression 'popup.options[myIndex]' [undefined] is not an object.
9/8/09 6:19:42 PM 1PasswordAgent[214] Shutting down 1PasswordAgent 2.9.29 #7569 built Aug 27 2009 20:46:40

Here's what to do to correct :
Erase those 2 files : "com.apple.AutoWake.plist" and "com.apple.PowerManagement.plist" in the Directory:
/Library/Preferences/SystemConfiguration/
While done, shut it down. If it restarts again, just shut it down one more time. After this, it will stays quiet until you ask it to reopen.

Intel Mini powers USB device after shut down

Last night I shut down all of my equipment and later returned to find that my Intel Mini (Core 2 Duo) was powering my Microsoft keyboard that was connected directly into the Mini. This happened once before with a USB-powered hub but I thought the problem was with Leopard. However, last night I shut down from Tiger so the problem is apparently with the Mini. The Mini shut down fine but then mysteriously repowered itself and the keyboard.
The only device connected to the Mini's USB ports now is a 7-port self-powered Belkin hub but that stays off once it's powered down. The problem only seems to be with bus-powered devices. I now have three empty USB ports on my Mini that I'm afraid to use with any bus-powered devices. Has anyone else experienced this with an Intel Mini? I have the latest Core 2 Duo model, 1.83 GHz, 2 GB RAM. Any advice, comments, etc. will be appreciated. Thanks.
Claire

Last night my Mini started up by itself again so today I checked the Console System log and discovered that a program I'm using for backups (Data Backup) was scheduled to run every half hour and, apparently, it tried to do that while the Mini was shut down. I guess it was successful a couple of times. I've disabled the scheduling feature of the program and I'll wait and see if that solves the problem.

My PowerMac G3 300MHz 512MB restarted automatically after shut down

The only way to turn off my G3 now is to switch off the mains. The problem still persists after clean install of the OS to 10.2.8. Also the shut-down key on top right hand corner of the keyboard no longer works. Is there a bug hidden somewhere in my desktop?

I'm thinking some hardware is causing this, do you have any PCI cards or USB/Firewire devices connected?
How to reset the SMU/PMU on a Power Mac earlier G3, G4, G5 models...
http://support.apple.com/kb/HT1939
Oh, after turning off the mains, does it startup by itself again when turning on the mains?

Stops responding when signing in to ebay and stops internet explorer also until computer powered back on from shut down

when asked to sign back in to my ebay firefox stopped resonding and when i closed it down and tried to reopen firefox it does nothing so i tried explorer and it also would not open.i tried a restart and it was the same.i shut down and they worked again but i still cannot use firefox to sign in to ebay,explorer works no problem.i tried resetting firefox to no effect and im using 1701 so no update available.i tried clearing cache and memory --no change(im on windows 7 home premium)on a HP laptop.this started 3 days ago

Try verifying the hard disk.
Boot from your restore disk while holding down the C key until you see the Apple logo, then let go of the C key. You'll see an Installation window, select English. From the Menu Bar, select Utilities/Disk Utility. Select MacintoshHD 10.x.x in the panel on the left, select the FirstAid tab, then click Verify. If DU reports errors, click Repair. If Disk Utility cannot repair the disk you have several options. One is DiskWarrior or
TechToolPro If Disk Utility can repair any errors, go back to the Menu Bar, click Utilities/Startup Disk. In the Startup Disk window select MacintoshHD 10.x.x and click Restart.
If you don't have a restore disk, try booting into Safe Mode
Carolyn

Satellite 2450 turn on automatically after shut down

My laptop is a 2450 Satelite and it has started to turn itself back on when I shut it down.
I believe this to be either a power supply problem or a mtherboard problem.
Has any other users had this problem and what was the remedy?
Thanks,
super1

Do you have a Network cable attached? Maybe Wake-On-LAN is enabled.
Or perhaps the LCD lid switch just needs a clean :p

Is it possible to continue downloading OS X Lion after shutting down the computer?

I am downloading the OS X Lion app on my MacBook Pro and is only at 180mb after an hour. I am downloading this app for free because I recently purchased a MacBook Pro. Is there a way I can continue the download even after shutting down the computer? Will I be charged the next time I try to re-download the app--as in, will the code for downloading the app for free expire?
Thank you SO much!

I downloaded OS X Lion over the period of a day or so and what you have to do is pause the download (for a snow leopard user that should be in your dock) and then shut down your machine. When you boot it back up, you should be able to resume the download by clicking the OS X Lion logo and typing in your Apple ID info and the download should resume at the same spot where it was when you left it.

My iMac screen keeps showing pixels of previously opened documents and Safari tabs and hour or two after closing them. The shadow of those opened documents are still there hours later after shutting down and restarting my computer. What is happening

My iMac screen keeps showing pixels of previously opened documents and Safari tabs and hour or two after closing them.
Even when I swipe to the dashboard the outlines are still there when I know they should not be.
The shadow of those opened documents are still there hours later after shutting down and restarting my computer.
What is happening and what shall I do? Thanks in advance.

Not much to go on in your product info, but maybe this will help: iMac (27-inch): AMD Radeon 6970M Video Card Replacement Program. If not, then it's time to visit an Apple repair station.
27" i7 iMac (Mid 2011) refurb, OS X Mavericks (10.9.4), ML & SL, G4 450 MP w/Leopard, 9.2.2

How do you get your same tabs to come up after closing firefox, after shutting down computer at night

I may have 4 different Firefox pages open with several tab on each....I got a new computer and now when I shut down at night it doesnt save my tabs.....so I can continue where I left off the day before?

In case you are using "Clear history when Firefox closes":
*do not clear the Browsing History
*Tools > Options > Privacy > Firefox will: "Use custom settings for history": [X] "Clear history when Firefox closes" > Settings
*https://support.mozilla.org/kb/Clear+Recent+History
Note that clearing "Site Preferences" clears all exceptions for cookies, images, pop-up windows, software installation, and passwords.
Clearing cookies will remove all specified (selected) cookies including cookies that have an allow exception and cookies from plugins.

Why my 2009 desktop with OS Maverick keep shutting down by itself

Why my 2009 desktop using OS Maverick keep shutting down by itself?

When it shuts down, the screen blanks (more like turns grey, like the color of the background when on the log in screen). It reboots immediately, so at first the problem was presumed to be restarting, not shutting down and powering back on. The computer is usually very warm, and definitely gets hot easily. A test was run determine when the fan would turn on to start cooling the computer by running digits of Pi, and the tester concluded it was too close within the safe temperatures before it would permanently affect the computer. (I believe this was within 5ºF, but I am not 100% sure.) The times when it will turn off and reboot do not seem coorelated with much if anything. It has done this at multiple times, among running varying amounts of programs and for different lengths of time: right after logging into the user, within a minute of after it has turned off and rebooted, within 5 minutes, 10, 30, even 60 minutes of turning off and rebooting, when only running one program such as Firefox, when running various programs such as Firefox, iTunes, Microsoft Word, Sticky Notes....
Basically, it makes no sense.

Laptop battery drains after shut down

Hi, I have bought hp pavilion 15-no28se six months back,
Its working good, but one issue is contantly irritating me, it is due to its battery drainage after shut down overnight.It almost drains 8-10 percent withing 12 hours. Whereas, I properly shut down it and caliberated as well, but of no use. Although, battery status is OK, and I think battery is fine becasue once I took out battery from laptop for 24 hours, then inserted again and checked it and not a single percent dropped down.
I am so tense that why it is draining when battery works well and properly shut down?Please guide me on this.I am waiting..

Hello again rocket_sc,
I hope you had a great weekend!
To test, calibrate, and re-synchronize your battery you will need to first follow the steps in this document on Testing and Calibrating the Battery (Windows 8). Once this is completed, and the battery continues to drain, then you can move to re-install the ACPI-Compliant Control Method Battery.
I understand that this process can be a little overwhelming, but not to worry! I would gladly expand on the steps provided above!
To answer your first question: you are not uninstalling the software as you would from Programs and Features (like uninstalling software downloaded from a CD). Instead, you are removing small driver components removable from the Device Manager.
To get the Device Manager, please follow the steps below:
Step 1. Go to Device Manager:
a. Press the  and type "Device Manager"
b. Click the Device Manager tab on the top right-hand side.
c. The Device Manager should be open.
Step 2. Select Batteries:
a. Click the right-facing triangle to the left hand side of "batteries"
Step 3. Right click the "Microsoft ACPI-Compliant Control Method Battery" that is listed there
a. If you see any duplicates of the "Microsoft ACPI-Compliant Control Method Battery", please select them both.
Step 4. Click Uninstall
a. You might also see an option that says "disable." Please disregard this option, and click on Uninstall.
Step 5. At the prompt put a check in the box to remove the current driver
Step 6. Restart the computer
Step 7: Remove the battery for one minute and then put it back in
When the computer comes back up it should automatically find and install the driver.
Step 8. Go to Device Manager
a. Press the  and type "Device Manager"
b. Click the Device Manager tab on the top right-hand side.
c. The Device Manager should be open.
Step 9. Select Batteries
a. Click the right-facing triangle to the left hand side of "batteries"
Step 10. Right click the "Microsoft ACPI-Compliant Control Method Battery" that is listed there (there should only be one).
Step 11. Click "Update Driver Software"
Do the same thing with Microsoft ACPI-Compliant Embedded Controller.
a. If you do not see this parcel of software in the Device Manager, please skip this step. If you do, the same steps would include:
* Right-clicking this device driver in the Device Manager
* Click on "uninstall"
* Put a check in the box next to "remove the current driver" and pressing "ok"
* Restarting the computer
* Remove the battery for one minute, then re-insert it
* Return to the Device Manager
* Right-clicking the Microsoft ACPI-Compliant Embedded Controller
* Click "update driver software"
Please re-post with the results of your troubleshooting, and I look forward to your reply!
Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

Why is my 2010 macbook pro freezing and shutting down every time I start it?

Today, after using my macbook pro to upload pictures from my iphone, my computer started having problems and shutting down. The screen goes gray and a box pops up saying that a problem exists and that I need to restart my computer. I've only had the macbook since last November, so I don't understand why I've been having so many problems with it. This happened a few times to a lesser extent in Senegal when I was there for 5 months. I used a mac power adapter so I don't think it could be an over-charge problem.
Please help!

Sounds like your iphone is causing kernal panics.
Unplug everything. Keyboards, mice, external hard drives, the lot.
One of these devices could be causing it.
Then, grab your Install DVD, and boot while holding the C button.
Select your language.
Go to Utilities > Disk Utility > Repair Disk + Repair Permissions
Then restart, and every once in a while, add one of the keyboards/mice/iphones/hdd's one by one to see if they are causing issues & therefore identifying the culprit.

IE had unknown error and after shut down laptop screen is blank

HP Pavillion dv6t Select Edition Customizable Notebook PC # A2Z58AV
Windows 7
IE popped up with a message that there was an error. No other explanation. After shutting down and rebooting, the laptop screen is black but has power.
No changes made to operating system before this occured.

Hi @devitojj
Welcome to the HP Forums!
I would like to take a moment and thank you for using the forum, it is a great place to find answers. For you to have the best experience in the HP forum, I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that when you power off your notebook it automatically restarts in 4 seconds.
You have tried several steps to try and resolve this but there is no change.
As it repeated the behavior with the hard drive removed, you know it is not an issue with Windows.
You have tried updating the bios and returning it to bios defaults but no change.
Here is a link from answers.microsoft.com that helped other people with this issue.
Windows 7 computer restarts automatically after shutdown
This does suggest you edit your registry which does have the potential to cause issues, so be very careful. I would also suggest backing up your registry before you attempt it, just in case.
Back up the registry from Windows.microsoft.com
If that has not helped, I would try removing the Cmos or RTC battery for 30 seconds and then replacing it.
Please let me know if this helped.
Sparkles1
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

Why is my computer powering up automatically after shut-down?

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