Macbook ran out of battery while installing OS X Yosemite. Help!

My Macbook Pro accidentally ran out of battery while installing OS X Yosemite. When I turn it on something loads on the bottom of the apple logo and then it takes me to a white screen with a circle and dash through the middle and it wont do anything from there. Help!

The first rule of installation is connect the AC charger!
Reinstalling OS X 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.
Reinstalling OS X Without Erasing the Drive
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 and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list. Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility 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 Disk Utility and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Also see:
Reinstall OS X Without Erasing the Drive
Choose the version you have installed now:
OS X Yosemite- Reinstall OS X
OS X Mavericks- Reinstall OS X
OS X Mountain Lion- Reinstall OS X
OS X Lion- Reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet
if possible because it is three times faster than wireless.

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My Macbook Pro 2014 ran out of battery while mid-slideshow. Now the slideshow won't skip through photos and I can't figure out why? Macbook Pro 2014 13-inch Intel i5 8GB RAM 128GB flash, iPhoto library is on external HDD

Macbook Pro 2014
13-inch
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I was in a slideshow, with around 1,911 photos in it. About halfway through, my Macbook ran out of battery. Now when I restarted and charged the Macbook and reopened iPhoto, the slideshow won't advance through photos, and I can't figure out any reason why it would do this.
I thought it may be corrupted, so I deleted and reinstalled iPhoto library, iPhoto itself, and disconnected and reconnected my external HDD.
This didn't work, the photos still won't advance.
I don't know any reason why this would be happening, and there is ample space on my internal drive.
I'm happy to provide more information if needed!
Many Thanks,
James

Make a few tests, James, to narrow down the problem and find out, if the slideshow is corrupted, your iPhoto Library, or settings in your account.
To test, if only your slideshow has a problem, create a new slideshow, just for testing. Just use "File > New Slideshow" and add a few photos. Does this slideshow play correctly?
If the test slideshow does not play either, create a new iPhoto Library. Use the File menu in iPhoto: File > Switch to library > Create New. Import a few photos and create a slideshow. Does it play?
If even a new library does not solve the problem, test in a different user account (see this document: Isolating an issue by using another user account - Apple Support):
This process involves creating a new user account, logging in to it, and testing for the issue.
Create a new standard or admin user account in Users & Groups preferences.
Use these instructions for OS X Mavericks.
See these instructions for OS X Mountain Lion.
See this video, or these instructions for OS X Lion.
Optional: If you have any specific files you wish to test with, copy (don't move) those items to the /Users/Shared folder in the Finder.
Log out of your current user account by choosing Log Out from the Apple () menu.
Log in with the new account you created.
Attempt to reproduce the issue you were seeing in your regular user account.
After you have completed testing, log out of the test account by choosing Log Out from the Apple () menu.
Log in as your regular account.
After you have completed all testing with the test user account, you may want to delete it. You can delete an account in the Users & Groups pane of System Preferences.
Note: Prior to deleting a test account, make sure you are completely done with it. If you have files in the Guest User you wish to keep, you should copy them to the /Users/Shared folder .
If you should find, that slideshows only play in a new user account, post back.

Mac book pro ran out of battery during install....powercut

Hi,
I currently have my old, MacBook Pro "Core Duo" 1.67 15" Model : a1150. 2006.
It's sitting dead under my bed at the moment, as last year while doing a fresh install of OS X my power went down and it ran out of battery half way through the installation..! School boy error.
When i power on the laptop, it starts up,but nothing displays on the screen. Its not backlit either or gray screen.
I've tried holding shift straight at start up, nothing
and also tried Shift-Command-V, nothing
I've tried putting in the OS X cd, 1 and 2 but it does nothing. It doesn't 'suck in' the cd. So it can't be read.
Does anyone have any ideas what they would do? It would be nice to get her up and running again..as she was working fine, just wanted to clean her up with a new install.
Any help greatly appreciated,
Nick

Go through these support articles:http://support.apple.com/kb/TS1367
http://support.apple.com/kb/TS1367
http://support.apple.com/kb/TS1587
http://upport.apple.com/kb/TS1365
If no luck, take it to an Apple store genius bar for a diagnosis, That will be free. If repairs are needed, those will not be free.
Ciao.

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Maybe:
http://lifehacker.com/5948155/fix-iphone-apps-stuck-waiting-during-installation
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Let it charge overnight.
Follow these documents.
http://support.apple.com/kb/TS2570
http://support.apple.com/kb/TS1440
http://support.apple.com/kb/HT1455
http://support.apple.com/kb/ht3964

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Apple Does Not recommend that. Please Read.
http://support.apple.com/kb/HT1490
From that article
"Portables with built-in batteries"
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MacBook
MacBook (13-inch, Late 2009) and later
MacBook Air
MacBook Air (all models)
MacBook Pro
MacBook Pro with Retina display (all models)
MacBook Pro (13-inch, Mid 2009) and later
MacBook Pro (15-inch, Mid 2009) and later
MacBook Pro (17-inch, Early 2009) and later
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Allan Mac wrote:
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Macbook ran out of battery while installing OS X Yosemite. Help!

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