Laptop Power Problems - Help!?

[Oscar]

Alrighty.
My laptop is just a year and 2 months old. I had to buy a new power cord last month because the other broke due to it being bent at the joint.
Now this new power cord is fine. I tested it with another laptop and it works just fine so the problem has been determined to be on the laptop itself.
The problem: When the power cord is connected, the battery indiator switches from being plugged in to being powered by the battery and it flickers to and from those stages like 5 times per second. I can't use my laptop with the power connected it because when the indicator says that it is charging, the mouse stops working and I use the mouse 75% of the time to do my work. Also the battery ends up dying because it never gets a chane to charge!
If I turn off the computr and let it charge, it takes forever becasue I assume it is doing the same thing while off, switching from charging to not recognizing that it has a power plug connected.
So I can basically state that either the AC jack has dewelded somewhat from the mobo, or the mobo is starting to go haywire.
I was wondering if you guys have experience this. When you connect the power cord to the laptop the power indicator goes from being connected to sucking from the battery and of course seeing the screen go from bright(connected status) to dull(running off battery staus)
If so, have you fixed this, how did you fix it and how much did it cost? Recommendations on what to do.
Thanks.

Is the power cord wiggling around when it does it?

[Oscar]

No.

[gouldy]

Can I just ask, is your laptop an Acer by any chance?

Oscar -- it sounds like it could be the sodering between the mobo and the input of the power cord that is loose. I have seen this before and that was the issue - of course, the input jack for the power cord could be [r] as well and need replacing.