My laptop charger shall not charge my computer.?

I have an HP Pavillion dv6000 and my charger will not charge it. I will disconnect the charger from the wall point, wait a while, and connect it again. The personal will charge for astir 2 secs, past stop charging. However, when my battery is fully drained, the charger will charge my laptop for an prolonged period of clip, as long as it's not disturbed. What's going on?