Why does my mac book turns off unexpectedly?

I just bought a new Macbook Pro yesterday. It was all fine and 2day I wanted to put some of my old pics on the computer. I connected pendrive to the computer and then macbook went dark. I tried to turn it on and it started working again so I connected pendrive again and it turned off again. But this time it didn't wanted to turn on. I tried few times more but still it was off. I tried also all of the tips from the instruction. Please tell me what can I do !

DAKINGGOD wrote:
WHY DOES MY MAC BOOK PRO SHUT OFF ON ME?
Not much to work with here...
How about more info so a diagnosis and help can be formulated? Mac model (size), RAM, OS version, age, battery status? What are you doing when it happens? How often? And if you want to be really abundant, pertinent logfiles?

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Why does my Mac keep turning off and on when I grab it ?

I was just using it watch a video than I left to go do something and when I came back to move to my desk it turned off than on. I shut it down and I was going to put it away it turned on and than off. Until I left on the table alone . I don't why this is happening.

mariposa2043,
which model MacBook Pro do you have?

Why does my mac mini turn off by itself?

My 2009 mac mini turns itself off after a few minutes. This started after a power failure. Might the logic board be fried?

1. Reset the SMC, as per > Resetting the System Management Controller (SMC)
2. Zap the NVRAM/PRAM, as per > About NVRAM and PRAM
3. Boot into Safe Mode, as per > Mac OS X: Starting up in Safe Mode
Then boot back into normal mode and if it is still turnning itself off...?
Run the Hardware test, as per > Using Apple Hardware Test

Why does my Mac constantly turn off

I was listening to iTunes on my Mac when it died. When it died, I put it on charge, and turned it back on. When turning it back on, it loaded for around 15 seconds, then restarted itself. It did this on a continous loop. The only way I am able to keep the mac on is to constantly press any key on the keyboard. By doing this I am able to log into my Mac and use it freely (as long as I am pressing a key). As soon as I stop pressing a key, I get a pop up asking if I'm sure I want to close the Mac down. If I click cancel, it still closes down. I don't know what to do to fix the issue...

OK, so let's first do a SMC reset -> http://support.apple.com/kb/HT3964.
If no luck with that, try booting into your Lion Recovery partition by holding down the command and R keys whilst booting. Once there, open Disk Utility and select your boot drive on the left (usually named "Macintosh HD" unless you've renamed it) and click on the "Verify" button. If you get red text saying that the drive needs to be repaired, click on the "Repair" button.
Call back,
Clinton

Why does my Mac Pro turn completely off while in the sleep mode?

Why does my Mac Pro turn off completley overnight when I had placed it in the sleep mode?

A power fluctuation may also shut your computer off from sleep mode.
Is there anything in the System Log overnight?
Here is a related article:
About diagnostic and usage data in OS X Lion and Mountain Lion

Why does my mac book keep shutting down? I mean it's on and then off suddenly

Why does my mac book keep shutting down? I mean it's on and then off suddenly

Do any informative dialogs appear after you restart it?
Power or other problems related to unexpected system sleep, shutdown, lights or fans call for an SMC reset. Read all the steps.
Before Resetting the SMC
Try each of the following steps in this order before you reset the SMC. Test the issue after completing each troubleshooting step to determine if the issue still occurs.
Press Command + Option + Escape to force quit any application that is not responding.
Put your Mac to sleep by choosing the Apple () menu from the upper-left menu bar and then choosing Sleep. Wake the computer after it has gone to sleep.
Restart your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Restart.
Shut down your Mac by choosing the Apple () menu from the upper-left menu bar and then choosing Shut Down.
Resetting the SMC on Mac portables with a battery you can remove
Shut down the computer.
Disconnect the MagSafe power adapter from the computer, if it's connected.
Remove the battery (to remove the battery - click here: MacBook or MacBook Pro).
Press and hold the power button for 5 seconds.
Release the power button.
Reconnect the battery and MagSafe power adapter.
Press the power button to turn on the computer.
Still having problems? Replace steps 6 and 7 with the following:
Reconnect just the MagSafe power adapter.
Press the power button to turn on the computer,
Then reconnect the battery.
Resetting the SMC on portables with a battery you should not remove on your own
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if it's not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. The power adapter indicator light will cycle off / on once.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.

WHY DOES MY MAC BOOK PRO SHUT OFF ON ME? SO FAR THE INFO I GOT 4 IT IS A MAC OS X VERSION 10.7.3 THE PROCESSOR IS 2.4 GHZ INTEL CORE 2 DUO MEMORY IS 2 GB 667MHZ DDR2 SDRAM I DON'T KNOW HOW OLD IT IS BECAUSE I BOUGHT IT USED SORRY I HOPE THIS HELPS THANK Y

WHY DOES MY MAC BOOK PRO SHUT OFF ON ME? SO FAR THE INFO I GOT 4 IT IS A MAC OS X VERSION 10.7.3 THE PROCESSOR IS 2.4 GHZ INTEL CORE 2 DUO MEMORY IS 2 GB 667MHZ DDR2 SDRAM I DON'T KNOW HOW OLD IT IS BECAUSE I BOUGHT IT USED SORRY I HOPE THIS HELPS THANK YOU

Sounds to me like you may have gotten a machine with hardware issues, but it's hard to say. It will shut down if it gets too hot, but that's not a normal occurrence. I have never seen a MacBook Pro shut down due to heat, even after lengthy 3D gaming sessions where the fans are running fast and the bottom of the machine is unpleasant to touch.
First thing I would try to do is reset the SMC. If that doesn't help, erase the hard drive and reinstall the system from scratch, which you should always do with a used machine anyway.
If a fresh system doesn't help, you'll need to get it checked out by Apple.
Edit: Oh, and sig is absolutely right... please don't post in all caps! It's very irritating.

WHY DOES MY MAC BOOK PRO SHUT OFF ON ME?

WHY DOES MY MAC BOOK PRO SHUT OFF ON ME?

DAKINGGOD wrote:
WHY DOES MY MAC BOOK PRO SHUT OFF ON ME?
Not much to work with here...
How about more info so a diagnosis and help can be formulated? Mac model (size), RAM, OS version, age, battery status? What are you doing when it happens? How often? And if you want to be really abundant, pertinent logfiles?

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Why does internet sharing keep turning off?

Are the Airport bars still black & showing good signal when it gets lost?
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Is the Ethernet Interface on the Mac that connects to the Internet dragged to the top of System Preferences>Network>Show:>Network Port Configurations, with Airport below it?

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Hi ManiPictures,
If your iPhone shuts down unexpectedly during use, I would suggest that you troubleshoot using the steps in this article -
If your iOS device restarts, displays the Apple logo, or powers off while you're using it - Apple Support
As your iPhone's operating system is already up to date with iOS 8.1.1, follow the last instruction -
If you still see this issue after updating, contact Apple Support.
Thanks for using Apple Support Communities.
Best,
Brett L

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It would be nice if you could include a kernel panic log to verify that your problem is...
Mid-2010 15" MacBook Pros - the bad NVIDIA GPU
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Here's just a sample of a kernel panic log that points to the faulty NVIDIA card:
Kernel Extensions in backtrace (with dependencies):
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            dependency: com.apple.iokit.IONDRVSupport(2.2.1)@0x82fd3000
            dependency: com.apple.iokit.IOPCIFamily(2.6.5)@0x7a802000
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Here's the "official" Apple take on the issue - but the very real kernel panics need not be preceded by 'Intermittent black screen or loss of video'... in fact, you might not experience any video problems at all. Although video problems can certainly be a portent of things to come…
So what can you do? Print out a copy of your kernel panic and a copy of the Knowledge Base article and take them, along with your machine, to your local Apple Store or an Apple Authorized Service Provider. The unfortunate thing is that many people have passed the “three years from date of purchase” now and Apple is not honoring the free logic board replacement for many users. Some dealers seem to be making some exceptions for those past the three year mark, but don’t count on it…
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Why does my mac book turns off unexpectedly?

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