First thing to do is update Yosemite. Download and install OS X Yosemite 10.10.2 Combo Update. See if that fixes the problem with the USB port. Be sure to try the drive in each USB port on the computer if you have more than one.
Drivers WD Universal Firmware Updater. Free Trial Driver Booster 6 PRO (60% OFF when you buy). My Book for Mac, My Book, and My Passport Ultra Metal external drive's firmware is available on the Firmware update for Mac users page, on Western Digital's website. Connect mobile device to the My Passport Wireless Wi-Fi network. From the App, go to the My Passport Wireless Settings. Select 'More' in the upper corner. Select Firmware. Update the Firmware if an update is available. How to Install the Product Update: Manual Download the firmware to your desktop.
If it still doesn't work then return it to the place of purchase for repair or replacement. If you wish to replace it you must do this within 14 days from date of purchase, and you must return the system to what was originally installed:
Install OS X Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
Reinstall OS X: Select Reinstall OS X and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.
Feb 8, 2015 11:35 AM