Either your laptop charger is dead or your laptop dc jack is loose. Try use a spare laptop ac adapter to examine it. If it will work well, that indicates you need a new charger, if it appears the same situation, you should repair your laptop dc jack. If you don't have a spare charger, just get one from the following e-shop:
Replacement Dell Studio 1555 AC Adapter 90Watt 19.5V 4.62A
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