How to fix a dead iPhone4?

Thanks for reading my question.
My iphone4 was dead after working fine for about 5 months, by which I meant the screen was black, and I couldn't get it back to work, I couldn't even turn on my phone. How should I fix it?
Thank you very much,
Qing

DO NOT TAKE ANDREW'S ADVICE!!!!! Try this first:
Charge for 30 minutes with the wall charger, then hold the HOME and SLEEP buttons at the same time until an Apple logo appears. You will have to hold for 10 to 15 seconds.
If that does not resolve the problem THEN restore the phone. But restoring is massive overkill and can result in lost data and settings, when all that is usually needed is a reboot.

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