MP450 User's Guide
Page 120
... is selected if either USBnnn (Canon MP450) or MPUSBPRNnn (Canon MP450) (where n is a number) is not loaded. Ensure that the USB cable is not installed properly. MP driver is securely connected to the computer. Follow the procedures described in the machine. If this error (Paper is not loaded) is... XP, click [Start], select [Settings], and then [Printers]. 2. z There could also be displayed. An Error Message Appears On The Screen Service Error 5100 is Displayed Cause Movement of the FINE Cartridge Holder is not correct, change the port setting according to the interface...
... is selected if either USBnnn (Canon MP450) or MPUSBPRNnn (Canon MP450) (where n is a number) is not loaded. Ensure that the USB cable is not installed properly. MP driver is securely connected to the computer. Follow the procedures described in the machine. If this error (Paper is not loaded) is... XP, click [Start], select [Settings], and then [Printers]. 2. z There could also be displayed. An Error Message Appears On The Screen Service Error 5100 is Displayed Cause Movement of the FINE Cartridge Holder is not correct, change the port setting according to the interface...