I have a late 2008 aluminum macbook. I was able to get an old HP Scanjet 5470C scanner from my friend. It's about 6 years old. But when I plug the USB cable into my Macbook, it does not recognize it. The scanner does not display under Devices in my Finder. Do I need a driver from HP? I thought all Macbooks didn't need any drivers for printers/scanners? Please help. Thanks!