I have a Dimension E520 Media xp and am trying to connect a lexmark Z65 i"ve had for awhile. I can't get the system to recognize the printer. I've tried all the available USB ports both front and back with the same results. I have the printer installation disc and have even down loaded the lastest drivers from lexmark. Nothing works. The printer has power. Im stumped. I've used this printer on two other computers. Any ideas?