I have a funny one here. Friend bought a printer/scanner/fax and installed on an older computor (6yrs old) through the USB port. All installed OK BUT.. when turning the computor on and the USB/Printer connected it won't post - if you take the cable out it works !! Any ideas - the ones I have are that the USB software may be version 1.0 and not 2.0 that the printer needs or that the printer is shorting in someway..