help

i have a note 4 n910t with 5.1.1 android on the phone i had a over heat on me (i left in my car) on june 14 and now a week later phone frozed up on me so i removed the battery now i wont turn on wont charge my computer chimes when i plug my phone into it i tried a new battery didnt fix cant get the phone into download mode nothing phone has no life is sitting in my room collecting dust the phone has been i a otterbox defender case from day 1 i would like some help there is any hope to fix my phone or should i just get a new phone

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