I have a Western Digital 320 gig external hard drive, and an Acer Aspire 5600 notebook PC. They were working wonderfully together, but recently my PC has completely stopped recognizing my hard drive. It doesn't even recognize that there is a device plugged in at all. The usb ports are all good, and the usb cable is good. I tried plugging the hard drive into another PC, and it was not recognized there either. Western Digital support has not been very helpful (they just told me to send in the hard drive since it is still under warranty, which I would rather not do, since I have a lot of stuff on there! ). Any ideas? Thanks.