Mt. Lion installation stuck at 4 minutes remaining = help

Never had this happen before during an installation. I am installing from a usb drive which I made
from my initial Mt. Lion installation so that I didn't have to tie up the servers/wait with each installation.
I have used this drive to install Mt. Lion successfully on another laptop (I am installing on a MacBook
Pro 2010 machine). This machine and the other I have previously installed on are all authorized on my
account. I have seen the Time Remaining get to under 10 minutes and then jump back to a higher time
before finishing but never seen it just stop. It has been about 45 minutes now. Thanks in advance for
any ideas.

Hello hughmourous,
Thank you for participating in the Apple Support Communities.
It sounds like your OS X Yosemite installation did not complete.
If you have not already, and your installation did not complete, I'd recommend holding down the power button on your Mac to turn it off, and try booting into Safe Mode:
Follow these steps to start up into Safe Mode.
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup sound, press and hold the Shift key. The Shift key should be pressed as soon as possible after startup, but not before the startup sound.
Release the Shift key when you see the Apple logo appear on the screen.
After the Apple logo appears, it may take longer than usual to reach the login screen. This is because your computer is performing a directory check as part of Safe Mode.
To leave Safe Mode, restart your computer without pressing any keys during startup.
From:
OS X: What is Safe Boot, Safe Mode? - Apple Support
All the best,
Jeremy

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