Powerbook turns off when I unplugged the Power Adapter

I month or so ago I noticed that when I unplug my power adapter it turns off instead of running off the battery. I've tried resetting the PMU but I didn't work. Does anyone have any advice or does anyone know what could be the problem.

I am experiencing a similar problem to Blaise. I have owned my 15-inch Dual-Layer SuperDrive for a total of 4 days. Last night I went to move my computer from the living room (where it was plugged into the wall for approx. 5hrs) to my bedroom. So I simply pulled out the power cable and the screen went blank. At first I thought it went to sleep (which was weird even if that was true), but then I tried to wake it up. Nothing worked. So I moved it into the bedroom, plugged it in, then I basically had to power it up as if it was off. Although, since it is the new PowerBook it was still able to write the contents of RAM to the hard drive (which is a really cool new feature). So the dimmed screen had the progress bar on the bottom as the previous settings were loaded.
Anyway, my long story aside. The battery level monitor in the menu bar, now says 0%, when I unplugged it, it said 99%. The green indicators on the battery itself all light up as if it is fully charged. I also looked in system profiler, where it says the capacity is 0mAh and the total charge is 0mAh. Then I ran apple hardware test, where it told me that no battery was present but it was still able to say it experienced "10 cycles".
I have tried to reset the PMU and the PRAM, no help. I've restarted to see if it would luckily rerecognize it. But nothing has worked.
I will be venturing to the Apple Store this afternoon. I hope it is an easy fix, i.e. just a new battery. Basically the current condition of my computer, is that I need to be plugged in to use it at all.
It must be reiterated that this is a brand new machine. And the battery capacity just hours before this incident was 3639mAh (I've been checking it periodically since I got the machine to see how the battery was doing on the first couple of cycles). And it had only experienced 10 charge-drain cycles.
If anyone has any ideas to fix this, I would greatly appreciate the help.

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