My iPhone 4 won't stop vibrating and the screen is black?

I have tried holding the home button and the power button at the same time for a few seconds but it didn't work. How can i fix it?

Microwave oven for two minutes.

Try this site.
http://osxdaily.com/2015/01/17/iphone-wont-stop-vibrating-fix/

It gives a short list of possible causes and solutions

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