The steps that worked for me are a mix of the steps described by IronBadger (for installing the printer with Snow Leopard and with Lion) and by some other posters (thank you all for your help!).
I installed the HP LaserJet 3055 printer/scanner in Lion 10.7.1 into two stages: - I first installed the printer/scanner connected with a USB cable - I then installed the printer/scanner so that it works with the Ethernet network cable.
Note: BEFORE doing the steps below I did NOT install the Apple 2.7 driver for HP printers. I installed this driver later, as explained below.
A) USB CONNECTION FIRST! -----------------------------------------
1. Eliminate all the currently installed HP software by using the uninstaller located in Applications/HP LaserJet Software/HP Uninstaller
2. Unplug the USB cable and the Ethernet cable from the 3055
3. Open the Print and Fax System Preference and <control> click or right click on the list of printers on the left. Select "Reset printing system...". Then click OK on the warning.
4. Reboot the Mac OS
5. Run the HP All-in-One installer rom the file LJMFP305x339xOSX10.5Update-v8.2.dmg provided in THIS directory:
(a) Click through any warning messages that appear.
(b) It may say that some kext file was improperly installed: ignore it
(c ) When the installer prompts for the USB cable to be connected do so!
(d) Once this install is complete click restart on the All-in-One installer window. The Mac OS will restart.
6. After the Mac has restarted, start the execution of the HP Setup Assistant in root mode. To do so, I opened a terminal window and executed the sudo command as follows:
sudo /Applications/HP\ LaserJet\ Software/HP\ Setup\ Assistant.app/Contents/MacOS/HP\ Setup\ Assistant
(a) DO NOT go past the very first promp of the HP Setup Assistant!
(b) Now run the usual Apple Software Update Check: it will find the missing HP printer driver and install it!
(if not, you can instal it directly from here: http://support.apple.com/kb/dl907 )
(c ) NOW continue with the HP Setup Assistant. It will show the 3055 printer that it finds in the small window. Click on this printer and then follow the instructions to complete the execution of the setup assistant.
I had several error messages in the terminal window where I executed the sudo instruction above. I ignored all of them, and waited till the HP Setup Assistant declared it finished the installation.
7. Now the HP 3055 should be functional for Scan and Print.
Try scanning and printing (all this with the USB cable)
Note that as IronBadger wrote in his posts, the HP Director may have to be restarted a couple of times for the printer to show up for scanning.
To avoid this annoying "feature" I put the "HP Scan" app directly on my dock: when I want to scan I just click on that app: it always work for me.
By the way, the path of this app is : /Applications/HP\ LaserJet\ Software/Scan/HP\ Scan.app/
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B) NETWORK CONNECTION ----------------------------------------
1. Disconnect the USB and put the Ethernet network cable, and restart the printer.
2. Locate the printer's web page (I gave it a static IP address in my Airport Express , namely 10.0.1.10) and open this web page on your browser just to make sure that the printer is indeed reachable on the network.
3. Run the HP setup assistant again using the sudo command above.
(a) On the first prompt of the the HP setup assistant, click "network".
- If it detects the printer in the printer's box, continue the installation as above.
- For me, it did NOT detect the printer on the network, so I entered the printer's IP address on my network, namely 10.0.1.10 . (I think you must click "create" to enter the printer's IP address). After this, I just followed the HP assistant instructions, till it declared that the installation is over.
Important: When asked for a printer's name, give the printer a name that is different from the one you gave it in the "USB" installation (in part (A) above).
4. The printer and scanner should work now. (use the HP Scan app that you put in the dock as explained in Part (A)).
5. Optional: Remove the USB printer that was previously installed by going to the Systems Preference, then Print and Scan.
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Thanks again to IronBadger and the other posters that helped with this.
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