This sort of thing happened to me recently.
Do you have a multimeter? Have someone check the voltage (Not current, you will fry the multimeter! ) while you try to start it. If it really is kerplunk, voltage will read << than 10 volts.
You can power many things with a dying battery, but a starter requires several hundred amps. Computers require a certan number of volts before they are functional. I hope this helps.
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