I'm hard on my power cords (position I hold my laptop, I guess), and they tend to stop working on me. So I have to keep buying new ones. But actually, it's not the whole thing that stops working on me, it's just the wire that goes into the plug which goes into the computer. So why do I have to buy a whole new AC adaptor each time? Can't I just buy the part that goes into the computer on one end, and into the AC adaptor on the other? If so, where? I have a Dell Inspiron 1100.