If you need to reboot and you don't feel like shutting down your apps one by one or waiting for Mac OS to walk you through them, press Ctrl+Cmd+Eject to reboot your Mac immediately, with no alerts.

The easiest and official way to factory reset your mac computer or your MacBook Pro to it's factory settings. By the way, if you read the description, I need to point some staff out. If you reset your mac, then automatically the newest version of Mac OS X will be installed to your computer.
Next, make sure that you know your Apple ID because you will be asked for it and if you don't know it, then you may need to click on forgot password, so Apple will send you instructions to reset your password and change it. Everything else is explained on the video.
Hope you find it helpful.
Reset your Mac options Since many people coming here use the term 'reset' rather loosely without specifics why, I've created this User Tip to show the three options: A: Wipe OS X, programs and all files off the machine and reinstall what you want from there. Used for fixing drive structure issues, malware issues or giving up ownership of the machine or setting a used machine that wasn't properly restored, to you personally.
Hard Restart For Mac
(see A below) B: Replace just OS X with a new copy, leaving files and most programs alone (should backup if possible). Used for fixing OS X based issues only for the current OS X operating system owner, will not change ownership. C: Create a new user account and transferring wanted files to that account and deleting the old one, leaves OS X and programs alone that are in the Applications folder, programs stored in the user account are deleted. Used for fixing in User account issues. Mac's do NOT come with System Restore options like Windows has, however if a TimeMachine or bootable clone drive was made previously the entire machine or files can be restored since the last update of either. Backup or perform user(s) files data recovery first if possible. You need to have two copies of your wanted users files off the machine to separate hardware, unmounting drive (drag icon to Trash to Eject) and physically disconnecting.
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Hard Restart For Macbook Pro

Restart For Macbook Pro
If your having software or drive problems I highly recommend also making a emergency copy of just your users files to another regular external drive as you might need to only restore those and everything else will be reinstalled fresh from original sources. If your boot drive is not booting: For a deeper understanding about the hidden partitions on a OS X boot drive: A: is broken into three parts. 1: Giving up ownership of the machine or making a machine your own. You have to install the operating system version that came with the machine from the factory or 10.6 (earliest you can). The upgraded operating system versions are tied to a AppleID and the next owner (or you) can't perform updates. You do this by holding command(⌘) option/alt r keys down (using a wired or built in keyboard) while on a fast Internet connection (Ethernet cable to the router preferred) and booting the computer into Internet Recovery. Disk Utility is used to erase the disk0 (if a boot hard drive, move the slider one spot to the right) and then Quit when finished and OS X can be reinstalled.