IPhone turns off after restarting?

I had to restart my iPhone and when i did, it showed the apple logo for a few
minutes, then turned off. Everytime i restart it the same thing happens, and when i connect it to my comptuter, it doesn't show up in iTunes. Anybody know why this happens, and how to fix it?

Try this. Hold Home and Down Volume and Power button all together at same time for about 4 seconds till progressive bar gets about half way mark then release the buttons then release n let it finish the process

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