RE: Do power cords go bad?
Sorry I didn't see this earlier. I would guess that the problem is not with the power cord, but the connection in the laptop. Don't know if yours is a Toshiba, but Toshiba laptops have had a lot of problems with the power connection breaking off of the motherboard, making it impossible for the computer to charge without soldering the connection back on. Another possibility is that the motherboard may have shifted in the case so that the connection isn't aligned anymore. Honestly, I haven't heard of your problem happening before, but it may be worth opening the case and looking around if you are comfortable... Hope this helps!