Disk Utility Help! There is no Mac HDD shown under my Hard drive.  Repair disk is grayed out.

I can't repair my Mac HDD in Disk Utility.  Nothing is popping up under my Hard Drive.  Please Help!

Yes, it matters. You need to repair the hard drive with the Install disc of the version of the operating system which is installed on the hard drive.
Try starting up in Safe Mode as an alternative to using the OS Install DVD in order to repair the hard drive.
Once started up in Safe Mode, you can click on the Apple logo in the upper left of the display and choose "About This Mac" to find out important information about the MacBook. What information is listed there?
After starting up in Safe Mode, try starting up normally and then go to Applications > Utilities > Disk Utility and repair permissions on the named boot volume.
I suppose you are having problems, or you would not be needing to repair the hard drive? You may want to let us know what problems you are experiencing.
Please include the exact model of the MacBook. You can choose from this list:
http://www.everymac.com/systems/apple/macbook/index-macbook.html
Also, which version of the OS is installed, how much RAM is installed, and what it the hard drive capacity and how much space remains available on it?

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