Under AC power the unit's CPU is usually set to run at full speed. A recurring issue with laptops is that most owners treat them like an appliance never thinking the unit needs attention to dusting and cleaning of the heatsinks or checking the fans and air vents. Here's an example cleanup.
Now that's the more extreme cleanup but note figure 5 and that lint buildup?
You should be able to use simpler methods like an compressed air can (use with care.)
For some reason last night my laptop just shut off. no reason, no warning, like i'd just disconnected the battery and the power cord simultaneously. Since then it has done this again once or twice, and i have no idea why. I'd assume some sort of battery failure, but it only seems to happen when the cord is connected (although i haven't tested this well, its just that i have the machine running next to me right now, and it's not plugged in and hasn't shut off, and the lack of wall power is the only difference i can think of between now and before). So in short, pointed english, the problem is that my computer likes to shut off as if i've been holding the power button down, without any warning or error message of any kind.
As i said, it's an HP pavilion zv6000 with an Athlon 64 processor, 100 GB HD, 512 MB RAM, the hard drive is full enough that i've been looking into an affordable outer HD for storage, i haven't defragged in way too long but now i'm afraid to. That's all the tech specs that come to mind. Oh yea, i run windows XP Professional.
Also, i dunno if any of this will help the diagnosis, but i sometimes leave the power cord in the wall without the computer attached, sometimes overnight, i keep the computer plugged in about ninety percent of the time unless i'm transporting it, and it's taken about half an hour to find this page, register and post and it has yet to shutoff on its own, i suspect that this is becuase it isn't plugged in. Any suggestion would help, as i'm trying to save for a move and can't really afford much tech support unless i wanna live with my parents for another month. I could also just use knowledge about the average price of a new power cord (or battery) and the best place to go for that, as the problem seems to be with power.