How do I know which component is failing in my laptops power system? (i.e. battery, charger, power supply)

How do I know which component is failing in my laptops power system? (i.e. battery, charger, power supply)
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Answer :

what is the model and age of the laptop? is the connection socket where it plugs into the laptop loose at all? often times the socket on the computer can become detached from the motherboard from being dropped on it, or hit while plugged in, or even just wear and tear after being too old. this is a rather expensive repair if it is the case. Chargers also die on cheaper laptops quite freqently. keep us posted
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