My daughter bought a (used) Dell Inspiron B-130 for school a few months ago and has gone through 3 AC adapters for it. The pattern is that they will work for a while, then get so that the cord has to be in just the right position for it to work, and finally it won't work at all. She's gone through three power cords in 4 months - the last one lasted for about 2 weeks. My question: Are these power cords THAT poorly made, or should I consider the possibility that there may be something wrong with the socket on the computer where the power supply plugs in? If it turns out the Dell cords are just junk, can anybody recommend a reliable replacement? At $30US a pop, this is getting to be expensive.