My iPhone will not turn on. When i press the on button, the screen will turn to the apple for about 10 second then the screen will turn black again and if i keep doing that it will repeat over and over again. I got decided to plug it into my computer to see if it would start to work and it wont even show up as plugged in on my computer or all of the other computers i have tried it on. Has anyone had a similar problem or can try to help me fix it. I really don't want to go all the way to the Apple store unless i have known i tried everything. Also, this is an unjailbreaked iPhone.