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Note for common printer problems
Customers receiving the"will damage your computer" message along with others like "unable to access cups/tmp" or "'@%' cannot be opened" need to update their version of the macOS. Please check this article for more information: "HPxxxxx.framework" will damage your computer" message in macOS Catalina or Mojave .
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Carriage jam but cannot find and obstruction. I have followed all directions from HP 7855

HP Recommended
HP Envy 7855

Envy Photo 7855  Carriage jam.   cant find obstruction.

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@cvpills54

 

Welcome to the HP support community.

 

Perform a power reset

  1. Turn on the printer, if it is not already on.
  2. Wait until the printer is idle and silent before you continue.
  3. With the printer turned on, disconnect the power cord from the rear of the printer.
  4. Wait at least 30 seconds.
  5. Plug back the power cable straight to a wall outlet and printer without any surge protector.
  6. Turn on the printer.

Update the printer firmware

Here are the steps:- Click here

 

You can refer to this HP document for more assistance:- Click here

 

I hope that helps.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.

Sandytechy20
I am an HP Employee

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