What printer did you connect....Laser printers need a IRQ. Check that the IRQ 7 (normally for lpt1 used) is available..IRQ5 is for lpt2....
If you installed an Inkjet, it does not need an IRQ at all.
Did you change cable as well? Some cable do not allow bi-directional communication as required by scanner and some printer.
One more thing, sometimes it just helps if you re-install the driver software.