Iphone 3g shut off and won't come back on?

I was sitting in the car listening to music when my phone jut shut off and now it won't turn back.tried the hard reset and that didn't work either i don't know what else to do. Help

Added (1). Its not dead it was fully charged!

I think it's out of battery.

Connect it to itunes and check if it recognize it.
you can also keep it out of dfu mode.
press and hold the power button for 3 secs
after 3secs, press and hold the home button with out releasing the power button for 10 secs
after 10 secs release the power button and keep holding the home button until you see the apple logo.

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