I have a Toshiba laptop that I bought back in 2005. I haven't really used it in the past year and a half because it shuts off within 20 seconds or less.
The battery will no longer hold a charge, but even when it's plugged into the wall it still shuts off. Today I just took the battery out and plugged it into the wall. It ran for about 2 hours (amazing!) and got my hopes up that I had figured out the problem, but it eventually shut off. Now it's back to shutting off within a few minutes.
The jack in the back that you plug the power cord in is also loose. You have to prop the cord up in just the right position for it to notice that it's plugged in. The cord doesn't fall out completely, it just is very wiggly in there.
Any ideas on what's wrong with it or how I can fix it myself? I'm broke and can't afford to take it to someone, really.