You don't mention whether you have tried your printer on USB.
Note that the drivers must be installed very carefully and EXACTLY the way described in the manual for it to work.
Another thing you might like to bear in mind is that sometimes printers will only operate on USB if the parallel drivers are installed as well. I have a Samsung laser printer like that. It isn't a problem, all I have done is defined the USB laser as default and I ignore the other one.