The B120 is very similar to the B130, 1000, 1200, 2000, 2200, and 110L series of dell laptops that are common laptops I see with the dc jack problem.
This B120 was no different. I plugged in the adapter and the Inspiron B120 powered in with no problems but any slight positioning of the adapter plug left or right and it would power off instantly. The B120 and B130 are a little easier to work on than the 1000 and 2000 series.
When the laptop was all the way torn down to the motherboard it had the classic burnt voltage pin that puts the jack slightly out of contact with the motherboard.
Soldering on a new dc jack fixed the problem and the laptop powers on fine.
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