About a day or so after I upgraded to Maverick operating system into my MacBook Air, my HP Photosmart D110 printer went down. It did this when I printed form Pages. Every time I tried to print the sheet would print just a few lines and then the printer put a warning into the display window telling me to turn the printer off. I did this over and over and it would just fail over and over. I finally decided to delete the HP print drivers from my hard drive Applications folder. In that folder, was an uninstall application. Make sure you then use the Utilities > Activity Monitor program to quit any HP programs running. Then empty the trash. I then rebooted my computer to flush out any running print driver. I then went into System Preferences > Printers & Scanners and viewed what print drivers I still had. The HP Photosmart D110 scanner was still there but the print driver was gone. I then mouse clicked on the plus sign and added the print driver. After all that, the printer worked perfectly.