That would leave the dc charging unit.....require laptop taken apart and repaired...not usually cheap.................or the battery which is how old and used how often....roughly 2-3yrs dependant on use.
You can buy an replacement laptop power adapter for your Compaq laptop or buy an OEM Compaq AC power adapter. There's a universal Compaq laptop charger you can buy that will charge almost any laptop with all of the power tip adapters.
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