WD Elements External hard drive not powering on

If this is an WD Element Portable (2.5")

Have you tried it with a different USB cable?,

Even with the shorter USB cable? 1 ft or 3ft 

On a different USB port?

On a different computer?

If this is an WD Element Desktop (3.5")

Have you tried it with a known good 12V 1.5Amp AC adapter?

Have you tried it with a different USB cable?

If you have tried all of the above but nothing improve.

You need to contact WD tech support for further help.

www.wdc.com/support