I have my HP Photosmart C4780 set-up via wifi to my iMac. Recently it has been giving me problems with printing. When I would attempt to print a paper, it would process it, and start to print. It would stop halfway through printing the page and then stop and spit it out; the rest un-printed. I have tried uninstalling and then re-installing the printer but it still has the same issues. The internet works fine off of wi-fi, so I am not sure what the issue is. If anyone has any input I will appreciate it. It's frustrating when I have to print a paper for class and it only prints 1/2 of a page.