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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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Printer won't turn on

HP Recommended
hp 6978
macOS 10.15 Catalina

Hp printer 6978 won't turn on.  It is plugged in and the light showing power supply is on is green but touch screen won't light up.

 

1 REPLY 1
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HP Recommended

@Naomi8

 

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

 

Let me know how it goes.

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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