I have an HP 6310 All in one printer that I use with older Mac G5 and G4 laptops all with the older power PC chip and OS 10.4.11 and wanted two back up printers in case mine gives up, so I bought two on ebay and the driver I have installed will not work. Both printers look identical to mine but one is model 6310xi and the other same as my 6310. I have my own driver CD but the two used ones do not have the original Mac CD's and I did not see the drivers on HP' web site. How do I get them working?