Touch the drive and put your ear to it, to test if the drive is spinning and working. Do this while it is powered on. Also, try disconnecting the USB cable, reboot the computer, re-connect USB cable to another USB port on computer. If you still have the same issue, try the below solutions.
- Make sure the computer and external hard drive are powered on.
- Disconnect the external drive's USB or the eSATA cable, which ever one you're using.
- Disconnect the power supply plug from the external drive.
- Power off the computer.
- Disconnect the computer's power supply cord for 60 seconds.
- Reconnect the computer.
- Power on the computer.
- Connect the power supply to the external drive.
- Connect the drive's USB or the eSATA cable and check for detection.
If the still no detection and still blinking lights on the drive, check the power supply to the drive.
Check to see what the led light on the power supply is doing.
If it's blinking, power down the drive, unplug data cable and then reconnect the power supply to another electrical outlet. If it still blinks repeatedly, then you power supply is bad.
If the led is solid (lit and not blinking) follow the same steps from above to connect it to another outlet.
Next, plug the power supply to the external drive and power it up.
If the power supply starts to blink repeatedly, then your controller board inside the enclosure is bad.
Thank you for the opportunity to help you.