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If those steps do not return the drive to correct function, it is very possible, even probable, that the drive has failed and needs to be replaced - see our Warranty page to check the warranty. If that does not correct the behavior, and if the drive is also not detected by your computer, the blinking light is probably a symptom of a larger problem. Safely remove the drive from the computer (if possible).ĭisconnect the external drive's USB or FireWire cable.ĭisconnect the power supply plug from the external drive.ĭisconnect the computer's power supply cord for 60 seconds.Ĭonnect the power supply to the external drive.Ĭonnect the drive's USB or FireWire cable and check for detection. Open Time Machine and choose the new My Essentials Book as the drive to backup as a Time Machine drive. Now, go to your Applications folder on your Mac hard disk. Ignore the drive and CD icon on the desktop. Make sure the computer and external hard drive are powered on. Plug in the 1TB Western Digital drive to power outlet and USB port. If your external drive's LED behavior has recently changed (and particularly if the drive is no longer detected or has changed the way it interacts with your computer), begin troubleshooting by following these steps: This article will provide numerous useful links for checking and troubleshooting this behavior. Troubleshooting and links for when the light or LED on your external drive is blinking.The behavior of the light (or LED) on your external drive can vary in meaning depending on the drive model.