Buzzing when on battery, displays "On AC Power"

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I recently acquired a Compaq Evo N600c laptop with a dead battery. I
purchased a new battery from a third party vendor on eBay and am
testing it out now. The battery seems to charge, but when I pull the AC
plug out a buzzing emanates from around the battery compartment, and
Windows does not indicate that a battery is present. The computer seems
to stay on, but with intermittent "flashes" where the screen dims for a
split second and the buzzing stops. Pressing the test button on the
battery shows that it is fully charged.

Any ideas what is going on? Is there some part which I can replace on
the motherboard (inverter?) that can make this problem go away? The
only thread I found which seemed relevant is this one:

Help much appreciated!


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