Basically, the plug where the AC adapter plugs into the back of the laptop (the female receptor) is loose. Now, the cord itself seats into the plug just fine, but the plug assembly itself is loose.
This, in turn, prevents the laptop from getting a constant power supply and when the plug moves slightly, it goes off cord power and right to the battery.
Now, I took the cover of the laptop last night to see if I could fix it myself, but it appeared that in order to fix the plug assembly (which is a small box about half the size of a die) I'd have to take apart even more -- which I wasn't really willing to do.
The problem appears to be a broken solder joint (I can't directly see it, but an uneducated guess). The computer itself runs fine, just on battery power, though.
Here's a pic of the problem:

Info on the laptop:
Compaq Presario R3000
s/n: CND40808RD
p/n: DS481U#ABA
Short vid (kind of blurry) of the problem: Click here for video explanation
Thanks!












