I just got a 40g notebook hard drive and wanted to convert it to an external drive. I bought a case that you put the hard drive in and it will convert to usb for both connection and power. When I plugged it into my notebook (compaq presario) windows xp found the new hardware, recognized it was a usb mass storage drive but could not finish installing it. It is not listed under my computer where the hard drives are. If i go to device manager the usb mass storage has a yellow exclamation point but theres nothing i can do to get the device working properly....someone please help me? do i need a jumper on the hard drive, do i need to format it? what do i do and how if it cant recognize it.