Paper Jams & Error 79 after firmware upgrade

[dabelson1]

This morning my 2 year old M255dw had a firmware upgrade. After that, it successfully printed 1 page of a 2 page pdf, followed by a paper jam. Tried reprinting different documents with same results - sheets feed only part way.  

Now  the printer keeps repeatedly reinitializing every couple minutes. Keeps reporting "79 SERVICE ERROR turn off and then on." Went through same sequence after rebooting with negative results. 

I've disconnected the power and the ethernet cable for 60+ seconds and rebooted without success. Also tried printing from another iMac and PC but sheets won't feed more than partway.

Contacted HP phone support and was connected to a third party service provider who wanted $400-500 so I hung up.  

Help! 

[sandytechy20]

@dabelson1

Welcome to the HP support community.

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