I assume this is connected to a network. If so disconnect the network cable and boot up the printer. I assume it comes to ready. Now attach the network cable and see if you can change the tcp/ip setting of the printer. If you can change the setting to a free address and load the printer as a local tcp/ip printer on one computer. Use the universal pcl5 driver and then see if that computer can print to the printer. If it can you have driver issues. You can also try to upgrade the firmware as 79 errors are similar to 49 errors and can be firmware related. The first thing to do is call hp since the unit should still be under warranty. Have them work with you over the phone to get it up and running. If out of warranty try what is suggested.
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