i have a keyboard with two usb plugs in the back. i use one for my mouse, then run the keyboard's connection into my computer. the mouse works fine, but the keys don't work at all [i'm using keyboard viewer to type now]. i plugged my 60gb external hard drive into it a few times this week, could that have something to do with it. any suggestions. thanks. update- i just plugged my keyboard in and it 'pushed buttons' on it's own. it held down the command keys, arrow keys, f12, etc.