iPhone won't turn back on

My iPhone recently will not turn back on. The phone was perfectly fine and then randomly I could not turn up the brightness. I then shut down my phone to reset it and it did not work. I then did that again and the white apple reset logo kept showing up and not actually rebooting. It kept turning on and off. I and currently on my computer and it will not let me factory reset the phone or anything. Does anybody know how I can get this phone to turn back on?