battery not charging

Battery probably dead. When your car battery won't charge, you need a new battery. Nothing different with computer batteries.

caw

A battery will only last for so many cycles. If it's an old battery, it may have run through them all.

Buy a new one.

I'm going to unfortunately echo the advice you've gotten here, the battery itself probably has to be replaced. They only last so long

If you're on a Mac, I can suggest a couple apps that'll tell you the health of your battery. No idea what the equivalents on Windows would be though.

On my old netbook I experienced a similar problem (one of the reasons I upgraded just the other day to a new machine). I had to flash the BIOS using a free program online. It was fairly easy and the battery started charging again right after I rebooted after flashing the BIOS.

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OK. Maybe the battery charging is being managed by some kind of program or driver or as FOTSGreg suggests the BIOS, and that isn't working for some reason. What I'd probably do is check the power management options and see if you can reset them. You could then try checking your drivers are up to date in Windows Update - the optional updates as well as the mandatory ones; install everything that looks like it might be related. If that doesn't work, try checking your BIOS version and see if there's an update. As it's a laptop, they'll probably have a big package of stuff under your model number in the support section of their site. And don't forget to google solutions to the problem if you haven't already - your model number and the words battery not charging should do the trick.