How can i reboot my mac without lion cd previous owner installed it thru itunes?

how can i reboot my mac without lion cd previous owner installed it thru itunes?

Lion is usually installed through the App Store not through iTunes. There is no Lion CD. If you need to perform activities normally requiring an installer DVD, then you do it as follows:
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
This will boot the Recovery HD and present a main menu of options such as Reinstall Lion, Restore a Time Machine backup, and run Disk Utility to repair the hard drive. There are additional options in the Utilities menubar item.

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