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First how many flashes? How many beeps? Probably due to that line of latitudes, the motherboard has gone bad. Ive replaced many of those series main boards due to cheap junk they put out before fully testing them. But, you need to count the flashes and beeps to see for sure. IVe replaced dell latitude D620 main board more timez than i care to count due to trashy design. I imagine the D505 is in that same line of garbage. <;0)
Notebooks and laptops have built in sound and not a separate card, unless it is extremely old. I expect the headphone socket is faulty due to the knock. I also suspect the software will show sound but nothing will play due to the broken socket. These are fairly cheap to replace. Take it to a qualified Dell dealer for service.
Bring it in the Geek Squad they can test your charger there, If the charger is ok send the whole pc to dell so they can check all the componets, charging unit might need to be replaced or you might have a short in the motherboard...
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