I have a end user that has an ipad and is printing to an HP color laserjet 2840. It is using airprint interface to print through the wireless network to thr hp. I can run a setup test print from the ipad and it does print black text.However when it does the rainbow logo test which is the next test it runs all it prints is solid black boxes. I have switched the printing to grayscale, because color is'nt even one of the options, and it still prints solid blk boxes. I am not much of a Mac person ,but I do know my way around a pc.