LG G4 hangs at boot screen ( not boot loop )

Hi, recently my LG G4 auto restarted and hangs at the boot screen. I tried to take out and put in the battery and i can't turn it on again. Hard reset doesn't work too. But, after a minutes when i try to charge the phone without battery, the phone shows a question mark. When i put back the battery, it turns on but still hangs at the boot screen. So i just want to know is there any other solution to this.