My Book World Edition 2TB power button won't activate network drive

I’m having trouble accessing my WD drive which I’ve had for 5 months now. The power button on top of the device no longer activates the drive, but it opens the lid covering the white drive case. Both my ethernet cable and my A/C adapter are connected to the unit as they always have. Whenever I disconnect and reconnect my A/C power, the bottom LED light shines for one minute then dims down.

What happened? Why isn’t the power button activating my drive like it’s supposed to?

Why is it opening the case lid all of the sudden? Is there any other way I can access my drive other than the power button.

I have same problem in WD Essential Edition 1TB.

Please guide me.