I have a black macbook core duo (not c2d). After getting it I upgraded the harddrive from the stock 80 to a seagate 120, and then put the 80 in an external USB 2.0 enclosure and have been using it for a long time, for about the last 8 months or so. Recently, however, my computer stopped recognizing it. The HD doesn't show up in disc utility or on the desktop, finder, etc, but under system profiler, it shows that a USB storage device is hooked up. I know the connections are fine because of this, and that the HD is powered up and everything like that, but for whatever reason, no dice. How do i fix this?