Iphone 4 went black and won't turn back on?

So last night I took my phone off charge and it was working fine. The battery was at 60% and i put it on stand by and set it to the side while I put my hair up before bed. When I tried to wake it back up, nothing happened. Just a blank screen. Tried powering it on and off but nothing even showed up on the screen. Tried holding down the sleep and home button and putting it on charge but nothing changed. Didn't make any noise whatsoever. I left it on charge and about half an hour later it started booting up, showing the white apple screen. But then it stayed like that for at least 15 mins without change, so I took it off and held down both buttons until the screen turned black and kept holding the home button (took advice from an Apple forum.) I tried powering it back on but nothing changed. I put it back on charge last night and went to bed, hoping it'd be fine but nothing changed. I still have a black screen and no response whatsoever.

Added (1). Also, I have no USB cable so i can't computer restore it. I charge using a TV dock. I thought maybe it was the dock but my dad put his ipod on it and it started charging right away.

I don't know a lot about that stuff but I would suggest calling apple support number and maby looking at there website here is there number: 800-694-7466 and the web site is: http://www.apple.com/...rt/iphone/

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