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.