01-12-2012 08:06 AM
Turn the product off, wait at least 30 seconds, and then turn the product on and wait for it to initialize.
If you are using a surge protector, remove it. Plug the product directly into the wall socket. Turn the product on.
The error 79 is due to an internal firmware error.
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02-10-2014 02:03 PM
I had the same problem on a cp2020dn with the error 79. The turn off and on and the surge protector information didn't work. Unlike others I had not downloaded the firmware update that others said was the problem. I down loaded the firmware update and I still got the message and the printer did not work. The problem it seems is not with the firmware or internal cards it is with the document the printer is trying to print. The particular document causing the problem with my machine was one downloaded from the internet. I went into control panel and printers then picked the driver that uses the cp2025 and deleted all the documents except the update firmware. The firmware updated and now the printer prints like new. By the way HP didn't charge for the firmware update and the machine was out of warranty since 2010. I am using a Z1 running Windows 8.1 with the cp2025 connected directly through a cat 5 cable.
09-15-2014 08:40 AM
Had the same error(79) and removing the oldest job from the print queue and restarting the printer did the trick. Printer started up, initialized, and went to Ready state. Then all other queued documents printed without error...