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Mac OS X in Bootable USB
Installing from Bootable USB
~Double-check to see bootable USB flash drive is securely connected to your Mac and restart the computer. Hit the Option key (Alt) when you hear the start-up chime at boot.
~Select USB drive in start-up drive selection screen and press Enter/Return on the keyboard.
~The El Capitan installer should initiate the setup in just a few seconds or minutes.
~Select Disk Utility and then hit Continue.
~Choose Macintosh HD from the left hand-side pane and click on Erase tab on the top-right portion of the window. Just click Erase button at the bottom right with all the settings at their default values. All files on your start up hard drive will be erased during this process.
~Return to the main screen where you selected Disk Utility, after the erasing process is complete. Hit Install OS X and then click Continue.
~Select the erased Macintosh HD partition (step 5) and then click Install. Assuming you have done the steps right, your computer should now be running OS X El Capitan with its completely revamped, new UI.
iMac (Mid 2007 or newer)
MacBook (Late 2008 Aluminium, or Early 2009 or newer)
MacBook Pro (Mid/Late 2007 or newer)
X serve (Early 2009)
MacBook Air (Late 2008 or newer)
Mac mini (Early 2009 or newer)
Mac Pro (Early 2008 or newer)
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USB for Bootable OS X at Geeks lab