If the phone won't boot at all, you don't really have many options. Try a jig & see if you can get into download mode. Also search for KingRat's 'jumpstart' method where you try and boot the phone with just the charger/without the battery.
Failing that, you could try another battery, but be aware that is unlikely to be the problem, and you'll end up with a new battery you can't use if you decide to get a new phone rather than have this one repaired.
Service centre or local mobile repair shop, most likely fix = motherboard replacement.
As to why/how it happened; who knows ? We don't have the phone in front of us & opened up in order to diagnose it. Nobody here can tell you that.
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