Me hard drive beeping? Wire?

Hi, I have a Verbatim 2.5" Portable Hard Drive USB 2.0 320GB. When I first bought it (last year) it beeped on a certain computer but worked for everyone else. The ones that worked had different types of windows so that wouldn't be the problem. After a year, I lost the cable and have bought a new one. This one however, was 30 volts (or something like that) and the hard drive beeped for every computer, even ones that were previously working. Only one computer sometimes worked. To make that one work, I hate to adjust the wire so therefore, it's the wire that are causing this. I'm gonna get a new cable but which one should I get. I don't have the instructions manual for the hard drive. Can someone help me?