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My Yosemite installation was at "less than a minute remaining" for about 5 mins. Then my battery died. When I charged and turned on the power, I got to the Yosemite login screen. When I log in, the password succeeds, then the login screen reappears but the screen freezes.

I've tried it about 20 times now. Same thing happens every time.

  • reinstall Yosemite, this time with power cable plugged in. – Ruskes Oct 25 '14 at 7:14
  • How? I can't get past the login screen. – user97516 Oct 25 '14 at 7:17
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Access OS X Recovery by holding Cmd ⌘+R from the time you boot your system until you see the Apple logo. Further instructions:

After your computer finishes starting up, you should see a desktop with an OS X menu bar and an OS X Utilities window with the options listed above.

In order to reinstall OS X, you need to be connected to the Internet using Ethernet or Wi-Fi. If you're using a wireless Internet connection, click the Wi-Fi menu in the upper-right corner of the screen to select a nearby Wi-Fi network. Choose your preferred network name and enter a username and password to join the network if needed.

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