"If you have Lion, there aren't any install discs available for the HP printers (at least not the one I have) and you just go through System Preferences>Print & Scan> Add a printer. It could require a little finagling and you will likely need to update drivers on your Mac once it recognizes the printer. Do that through System Update on your iMac. HP hasn't made this smooth or easy, but it is doable"
I have all done the above, eventually, through Wi Fi, but I still get a message on the iMac that the printer is busy, although it printed the test page perfectly. Must be a small tweak, just don't know what it is.