During boot down the OPTION key until a boot selection menu appears, choose “Install OS X Yosemite” as the drive to boot (this is the USB installer). Attach the OS X Yosemite bootable installer drive to the Mac, then reboot as normal. 
Back up the Mac with Time Machine or by manually copying your most important data to an external drive – never skip backing up your important data. How to Perform a Fresh Installation of OS X Yosemite on a Mac Be sure you have your important files backed up before attempting this. 
Important: A clean install of OS X Yosemite requires formatting the Mac hard drive, meaning all contents on the disk will be removed and erased. If you haven’t made one of these yet, do that first
An OS X Yosemite bootable installer drive – usually this is a USB disk but it can be whatever so long as the drive is bootable, the installer by itself is insufficient unless you’re fresh installing onto a different partition or volume. A Mac which can run OS X Yosemite – in terms of system requirements, the machines which support Yosemite are the same as that which can run Mavericks. The requirements for fresh installs are fairly straightforward: For those who are interested in performing a clean install on their Mac, which basically makes OS X Yosemite appear as if it was brand new, without any settings, preferences, apps, or anything else carried over from before, we’ll cover the process thoroughly in this walkthrough.
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