Tried to install Yosemite on Macbook, now it won't start up properly..

Hello,
I updated Yosemite to my late 2008 Macbook(seemed to work fine) and now when I start it up, it goes to the "OS X Installer screen" and stops. It says to click continue to set up the installation of OS X, which I've tried and it just sits there telling me that it'll take 22 minutes and then after a while it says OS X could not be installed, "File system verify or repair failed". It says to quit the installer and restart and try again. I keep trying, but it does the same thing every time.
Not sure what to do. Any suggestions would be much appreciated...
thanks.

You didn't mention what OS you were running. If 10.7 or above, boot into the Recovery Partition (command - R on a restart) and run Disk Utility/Repair Disk/Repair permissions until you get no error. Reboot normally and see if the installation will finish.
If you were running10.6, boot off the DVD and do the above.

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Tried to install Yosemite on Macbook, now it won't start up properly..

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