My lenovo tab a3300 wont turn on and keeps on vibrating?

[Android Central Question]

I powered off my lenovo tab a3300 and after 5 seconds ur started vibrating and it's not stopping...
I tried holding the power button and volume up button but that was of no use... I even tried the reset button but that didn't help either...
Now m waiting for the battery to drain out (let's hope that works)
If anyone has any suggestion, idea or solution please tell me...
Thanks in advance and your response will be highly appreciated.

 

[B. Diddy]

Welcome to Android Central! Is anything showing repeatedly on the screen (like the Lenovo logo)?

To force a shutdown on most Android devices, you typically hold just the Power button for at least 20-30 seconds. Is that how long you held it for?