Hi, I have a 500GB Exernal Hard Disc and have not been using it for a long while. I found it somwhere last weekend and tried it on my Mac, Dell, or network. None of them were able to read it successfully. The indication light was on. From the sound came out of the external HD, it sounds like it is working. I also tried switching th mini-USB cable but it did not work. I remember in the past, it always took a while to read this external HD and I used to use it for Mac Timemachine backup. Now i'm completely clueless how I should do to make it work again! Any advise?