Hi, I've got a small portable hard drive that I use to store my photos connected to my PC and up until recently all has been fine. Now for some strange reason the PC no longer sees it. I've tried plugging it into other PC's and it is fine but plug it into my PC and all I get is the bingly bong connection noise repeated every few seconds. I've tried it in different usb ports and the result is the same. Any ideas? Thanks.