IPhone turned off during update won't turn back on?

Yeah i was updating my iphone software and the battery crapped out while it was doing it so when i got home i was just going to charge it and finish the update however it shows the apple for a few seconds and then goes to black and keeps doing this it won't turn on i dunno what to do i can't call anyone because it is my only phone suggestions please i'm starting to get worried that it might have gotten totally messed up. I have the iphone 4 the white one

Added (1). Sandy thanks for the answer but it didn't help it still shows the apple logo for a few seconds and fades to black

Plug in your phone not in the computer but wall socket after you do that hold down your home button and the power button at the same time for about 15 sec. After that is done leave your iphone plugged in and update go to settings= general and look for software update click on that let run it's course hope this helps.

If it was jailbroke on 5.1.1 updating to ios 6 will brick the iphone/

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