And BTW, here's a repost of what I posted on July 7th:
I'm running a 2013 Macbook Pro, 2.4 GHz Intel Core i7, 8 GB 1600 MHz DDR3, OS version 10.9.4 (updated to this OS version 5 days ago, on July 2nd). For a little less than a year I've been printing to a HP LaserJet 400 Color MFP M475dw via wireless connection. A few weeks ago I began to have numerous "printer is not connected" events, and it reached the point I could not print anything - from my MacBook, my iPad Air, or my iPhone 5S. I discovered there was an updated printer driver on HP's website, specifically for OS 10.9. Downloaded and installed it, and the problem was seemingly solved.
Then I updated the OS to 10.9.4. AARRRRGH!!!!!! For the last 5 days, the printer will - sometimes - print the first document in a queue of 2 or more and then, while the printer is still "running," tell me the printer is not connected. I turn the printer off and back on, get one print job, then have to repeat the process. Here are all the things I've tried to resolve the issue:
- Verified settings on the printer to make sure everything is set up properly
- Restarted Airport Extreme, printer, and MacBook (multiple times) -- clarification: I turned off both the MacBook and the printer, then unplugged Airport for a few minutes, replugged it, restarted the printer, then restarted the MacBook
- Reset the printing system (as suggested elsewhere in the Support forums), which basically removes all printers from the MacBook, then lets you add back those that you want - presumably with the most current driver(s).
- Searched help/support forums on Apple, HP, and the internet in general
- Found a firmware update for the printer on HP's website -- but it is not compatible with OS 10.9 (only goes up through 10.8). I downloaded it and tried, even though 10.9 was not listed, and the "app" wouldn't even open.
All of these efforts have been to no avail. The problem persists, and I'm at my wit's end how to solve it. HELP, please..........anyone??????