Wireless Printing No Longer Working

I have been printing wirelessly for the past few weeks with no problem when suddenly today my computer can no longer locate the printer. I have tried reloading/installing the printer but it still cannot find it (despite it being set up on the same network - which the installer acknowledges).

I am running Lion OSX 10.7.2 and the printer is an HP Deskjet 3050A.

Help?

Re-connect printer via USB and then try doing a test page also hit software update in system preferences to see if there are any driver updates if this is successful disconnect the USB and try resetting the wireless function.

the printer definitely works via USB - I tried reloading the computer and the wireless function and rebooting the printer and my computer... still no luck...