Envy 7640 touchscreen does not work at all

[Scumrock]

Printer prints OK when I start a print job from my PC.  But the printer's touchscreen, where I can select Copy or Scan something that I put on top of the printer, does not accept any touching that I do.

[Riddle_Decipher · Accepted solution]

@Scumrock

Welcome to HP Forums,

Let's get straight to it!

I suggest we reset the printer using the below steps:

• Turn on the printer.
• Wait until the printer is idle and silent before you continue.
• Disconnect the USB cable from the rear of the printer. If your printer has a network or wireless connection, leave it connected.
• Remove the ink cartridges from the printer.
• With the printer turned on, disconnect the power cord from the rear of the printer and from the wall outlet or power strip.
• Wait at least 60 seconds.
• Plug the power cord back into the wall outlet.
  •  NOTE:
  • HP recommends connecting the printer power cord directly to a wall outlet.
• Reconnect the power cord to the rear of the printer.
• Turn on the printer, if it does not automatically turn on.
• The printer might go through a warm-up period. The printer lights might flash, and the carriage might move.
• Wait until the warm-up period finishes and your printer is idle and silent before you proceed.
• Reinsert the ink cartridges, and then close the ink cartridge access door.
• If you receive a prompt to print a calibration page, do so.
• If you disconnected the USB cable, reconnect it to the rear of the printer.
• Try to print.

Also, try updating the printer firmware and check if it helps.

Link to update the printer firmware.

(Instructions on how to upgrade firmware are listed in this link: Click here)

Keep me posted, as I (Or a trusted colleague) shall follow-up on this case to ensure the concern has been addressed, 

And your device is up and running again, only in case you don't get back to us, first! 

That said, If the information I've provided was helpful, give us some reinforcement by clicking the solution and kudos buttons, 

That'll help us, and others see that we've got the answers!

Good Luck.

[Scumrock]

Thanks, I'll try the full reset that you mentioned.

[Riddle_Decipher]

Alright, please do and get back to us with the results.

Good luck.

[Scumrock]

My printer's touchscreen now works, thanks to your suggestion of a total disconnect and reconnect of USB and power cables!

[Riddle_Decipher]

@Scumrock

Thank you for the update,

I appreciate your time and efforts, 

I'm glad I could contribute to identifying and leading you towards the solution.

Thanks for honoring us by accepting our post as the solution, as it helps the community grow.

I must say, it's been a genuine pleasure interacting with you,

You can always click the "Thumbs Up" button to give me a Kudos,

Take care and have an awesome week ahead.

[Mamawatoto]

This was so helpful. I was about to throw out my printer until I read this solution. \

Thank you so much.