
Now click on Install OS X and then hit Continue. Step 6: When the erasing process is complete, return to the first screen where you selected Disk Utility. This will wipe all files stored on your startup hard drive. Leave all the settings at their default values and then hit Erase button at the bottom right. Step 5: Click on Macintosh HD from the left hand-side pane and then hit Erase tab on the top-right portion of the window. Step 4: Click on Disk Utility and then hit Continue. This could take a few seconds or minutes.

Step 3: Wait until the Yosemite installer appears on screen. Step 2: Choose the USB drive on the start-up drive selection screen and hit Enter/Return on the keyboard. As soon as the start-up chime plays, press the Option key (Alt). Step 1: Ensure the bootable USB flash drive is plugged into your Mac and restart the computer.
#Download os x yosemite installer how to
How to Clean Install OS X Yosemite on Your Mac The OS X Yosemite bootable USB flash drive will be ready for use and you can start the clean installation process. Once the process completes, you will see the message " Copy Complete. Do not interrupt the Terminal or eject the flash drive during the process.

