my phone will not power all the way on. it's frozen at the lg logo. how to fix it?

leporcha

    my phone just powered off and rebooted on it's own but stopped at the lg logo. i had to take the battery out to turn it off because the buttons wouldn't work. i took out my sim and sd card, replaced the battery and pushed the power button. the lights come on, the lg logo appears then nothing but the logo for like an hour. tried a hard reset but it wouldn't let me confirm the factory reset. it froze at the confirmation. how can i fix this?

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