Mac OS X Installation from Hard Drive
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If the optical drive is busted or you want to quickly install OS X, put the OS X Installation disc on a external hard drive and boot from that drive.
Steps
- Create a dmg-image of the Installation disc using NetRestore
 - Open Disk Utility and pick the external drive to put the image on from the menu on the left
 - Go to the Restore tab and click Select and find the dmg-image
 - Second, drag the external hard drive icon from the list on the left to the Destination field
 - Check Erase drive and click Restore, after a few moments the image will be successfully dumped to the drive
 - Once done, shutdown and replace the old system drive with a new one if necessary and press power to start-up
 - Hold the Option key (between CMD and CTRL) to enable the boot screen where the available boot drives will show up
 - Select the Installation disc and follow the standard installation process