I think you're right. This generally happens from bending or yanking on the cord. Was there one particular section where you had to play with it to get it to work? If so, you have found your break. Take a sharp knife (a box knife or exacto would work fine) and carefully cut away the insulation at that area (with the unit unplugged, of course). At this point it doesn't much matter whether you cut through the cable again, but you need to know when you have found the break so you actually fix the problem. Once the break has been located (the frayed ends of the cable will probably be somewhat burnt and melted from sparking while you were playing with it) you need to cut the cable in half at the break, strip off the outer insulation (cables of this type generally have a black layer of insulation over two separate wires with their own colored insulation) and strip a half inch of each of the wires. Actually, there isn't a set amount that you have to remove, just enough that you can twist the ends securely together. Once you have them stripped, make sure that you have at least as much insulated wire sticking out of the main insulation as stripped wire, because you will need to get tape between the wires. Now take each half of your cable and bend the two wires sticking out of it 90 degrees in opposite directions. Take the strands of copper on the end of each wire, smooth them and twist them lightly to keep them together. Next, lay the two halves of the cable and lay them end to end with wires of the same color next to each other. Twist the exposed ends of each wire together, making sure to keep SAME COLORS TOGETHER, and, if you have an iron or gun, solder the joints. If you don't, make sure that they are tight enough that they won't come apart, but not so tight that they are deformed or strained. Fold them back against the insulated wires, pull the wires so they are parallel (and maybe a little tug to make sure they don't come apart) and wrap electrical tape around each individually. Make sure that the bare parts can NEVER touch. Now tape the two wires together and test before plugging into your computer. A note about applying electrical tape: it will go on smoother if you stretch it some before using it, and it will pull itself tight also. If you couldn't solder the joints, I would arrange the cable in such a way that it cannot get yanked; maybe make a loop with the joint in the middle and tape it together.