For a while, my laptop has had some problems. It started with my first AC adaptor being plugged in, and not reading it all the time. I'd adjust how I was sitting and it'd work fine. But it continued getting worse and worse until the point that it didn't work at all. I was able to use another charger, and it worked just fine; so I figured the charger just went bad. However, I got a new one after I moved and it worked great to start..and then the same problem came up, again. So I'm assuming it's a problem with my computer.
I've also had problems with two mouses not being able to be detected anymore, and two phone chargers (the iPhone ones) not working anymore after being used in my laptop.
I do need a new battery. It's always got a red X on it and suggests I get a new one. I keep my laptop plugged in almost all the time, because of how bad the battery was. But it wouldn't explain the bad mouses/chargers would it?