SOURCE: My hp laserjet 3030 keeps reading 79 error power on power off
79 errors are often fatal. Your only hope is to get it back to READY, then update the firmware before it reverts back to 79 ERROR. The other option is to replace the formatter, but it would be about the same cost to replace the whole machine.
SOURCE: error 79 hp laserjet m2727nf mfp; error 49 hp laserjet m2727nf mf
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49 and 79 Errors, Turn off then on
The product has experienced an internal embedded software error.
Turn off the power by using the power switch, wait at least 30 seconds, and then turn on the power and wait for the product to initialize.
If you have recently installed a memory DIMM in the product, turn off the product, remove the memory DIMM, reinstall the DIMM to verify that it is seated properly, and then turn on the product.
If the error persists, contact HP. See www.hp.com/support/LJM2727 or the support flyer that came in the product box.
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