I have a HP OfficeJet Pro 8710 printer that is currently in a state that doesn't allow me to reset nor get into the support menu. This started as a failed printhead error message. I recently purchased a new printhead from a 3rd party seller on ebay, but the model of the printhead is the same. The new printhead doesn't seem to be the problem here as when I first put it in the error message for print head was gone.
Context: As part of troubleshooting the old printhead error I reset the printer to see if that would fix anything. When it didn't I went into the support menu (hitting back 4 times) to do a full reset back to factory defaults and initialization. That didn't work, and the printhead error prevented completing setup. So the only way I could then access settings was via the support menu (hitting back 4 times). After this I did some other troubleshooting which I forget, but wasn't substantial, I did a partial reset. When I got the new printhead, I replaced the old one with it and and went into system configuration to turn on trade OOBE. The print head error disappeared, but then I got a message saying to use the cartridges that came with the printer. I forgot what I did after that, but it either was causing an error state by removing the print head or starting up again that allowed me to get to the support menu to do a full reset. I went into the IT setup and picked the option that wasn't instant ink and picked to setup for my current location. After that, I needed to set localization and then the screen after that I got a message saying to use the cartridges that came with printer. The difference this time is that now the 4 back button for support menu didn't work. Opening the ink door doesn't cause an error and subsequently closing it causes the screen to go all white after closing the door so I can't access any settings. I tried getting the printer in an error state so I could use the 4 back button by putting the old print head with no ink cartridges in it in and turning it off and on again with the old printhead and no error occurred or change of state that would have allowed me to get into the support menu. After that I have tried many things to try and force an error with no avail. Here is what I have tried:
Starting the printer the old faulty printer head with no cartridges
Starting the printer with the old faulty printer head with cartridges
Starting the printer with the new printer head with no cartridges
Starting the printer with the new printer head with cartridges
Starting the printer with the old printer head with no cartridges while the back paper feeder door is open
Starting the printer with the old printer head with no cartridges while the back paper feeder door is open and taking out the part back there that has wheels to feed the paper
Starting the printer with the new printer head cartridges while the back paper feeder door is open and taking out the part back there that has wheels to feed the paper
Doing 1-7 with the ink door open. Some I did with the paper tray open, not all through.
Having the ink door open, paper tray open, back door open, back roller removed, printhead removed (need to verify forgot if I did this)
Start the printer with the ink door open and the paper tray open.
Start printer with new printhead with only Cyan.
Start printer with all cartridges except Black.
Connecting to the printer via ethernet directly, accessing the web configuration via HP Smart, and attempting to reset to default settings there (it gives a message along the lines of saying the printer is not available when I try to do)
Unplugging for 60 seconds and then holding power button for 30 seconds then replugging
Sending the printer a document or binary data with lpr, but just a sound occurs and nothing happens.
Checking for firmware (it errors saying it can't find the network despite me doing the WiFi setup via the web configuration in hp smart and connected to my laptop via ethernet (I can understand the latter though since I didn't set up bridging of any kind). While I was troubleshooting the old printhead, I updated the latest firmware and it's been a week since then so I doubt that even if I were able to get it to check for firmware updates it wouldn't find anything. Though despite that, the date that it showed for the last update/firmware version was around October 2020)
I know there's more combinations I can try, but I don't feel this could have an effect. It just seems like if an error popup that should occur the "Install the cartridges that came with the printer" message overrides that and stops that from happening. If there is some secret way of forcing a message or allowing the screen to get into a state to allow getting to the support menu that would be great. I'm open to anything whether it be some esoteric print command line to send low level signals, using undocumented PCL/PJL commands that somehow are still compatible with this printer to reset it, using some method to send pure garbage data to the printer so it does something, or just trying out more combinations. I need a way to force an error message and I need to test it within next 24-48 hours. The end goal is to be able to get back to the initialization menu and figure out setup option order can bypass the "Install the cartridges that came with the printer" message (when message first came, before I couldn't go to the support menu anymore, at least enabling OOBE and doing IT setup without instant ink and setup at current location didn't bypass the message) so I can get to the control panel and be able to print.
Note: When I got to the web configuration for the printer, it often shows an error that the printerhead is faulty and the black ink has no ink left. But shows ink level for the rest of them which is low, although I know that reading is inaccurate since when I was still able to access support menu and look at ink levels it was at the same level and it was either refreshing them or opening and closing the door that allowed the values to refresh and they were above than what the reading in HP Smart shows. I think these ink indications are due to the printer not being able to fully initialize yet so there's faulty data.
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