Same problem here, but the "reboot, reset, power off and on" thing didn't work. I also "forgot" the network and found it again, but no progress to report. It was running last week, but not now, and I have not upgraded the iPad OS (I'm holding at 8.1 after the 8.0 fiasco). The HP print app (ver 4.4.0) could not find the printer. I had to provide the IP address, but then I could print reports from the HP print app, so the iPad is talking to the printer. but cannot print anything from other apps, like Notepad, Pages, etc. After "contacting the printer" for several minutes, it eventually returns a "printer is offline" message. Seems odd, but there's a hand-off problem between the HP print app and the other iOS apps. We have another iPad in the house that has developed the same problem.