Why won't my Iphone 4 turn on?

I was just watching a video then all of a sudden it turned black and won't turn on. So I go, "Wtf?"
I just go "meh" and plug it in. I go on my computer and play some videogames and 1 hour later, it still isn't turning on. So I try to turn it on by holding the home button and the power button for 10 seconds but it STILL didn't turn on. I need help because I'm extremely confused. Thanks.

Added (1). Oh, also the screen gives the apple logo and then it like restarted again. So it goes on and off.

Hmm… Seems like a internal faliure of SOMETHING. Leave it off overnight tonight then try to turn it on in the morning, if not successful, get a appointment at the genius bar.

Dead battery.

It seems like your battery got busted or something inside the phone just broke. Best to have it fixed by a technician so you don't make things worse.

If you think the phone isn't worth fixing and you want to get the new iPhone next month, you can sell your old iPhone at www.eCycleBest.com. They take in broken iPhones so it's a good deal.

Hope this helps.

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