Ultra traveldrive not readable. I've been using a Memorex ultra travel drive 160GB for about a

Question

I've been using a Memorex ultra travel drive 160GB for about a year now and it's been fine but lately when I plug the 2 USBs into my laptop or desktop, it doesn't light up at all. The computers can't detect the hard disk at all. How do I get it to work? When I plug either one of the USB in, the light goes green for 2 seconds and that's it. I can hear the drive reading but the computer can't detect it.