I have a HP 7800 that has worked fine. It now is connected to the internet’s is my Window-10 compu

[Navygm1]

It now will print from my iPhone but not from my computer. No past problems. 

[BeemerBiker]

Settings may have changed and the computer may not know it.

Enter "add printer" in the windows search box and have it search for the printer.  If it is found and works then be sure to delete the non-working and set Windows default to use the new one one.  You should also prevent windows from handling the default printer.  Sometimes windows make a poor choice of devices and send large document to a small label printer.

Win11

Win10

You did not mention your computer so I assume windows.  Apple has their own community for help.

[BeemerBiker]

Not sure if this applies to you but the 7800 series of photo printers has a firmware updates since just this last December.

discussion here

https://h30434.www3.hp.com/t5/Desktop-Wireless-and-Networking/Wireless-connection-keeps-dropping/m-p...

You might check your firmware version and update.  

go here

https://support.hp.com/us-en/drivers/selfservice/hp-envy-photo-7800-all-in-one-printer-series/907315...

and change from 7855 to your exact model and OS to see if you have the latest and greatest.

[Mans]

@BeemerBikerand @Navygm1 

Hello,

Additional information:

Please update the firmware of your HP ENVY Photo 7855 printer (HP ENVY 7800 All-in-On series Printer): The latest version is 2204E (only available by searching via the printer's Web (EWS) page or from its touch screen).

Firmware Version	2204E
Built Date	2022-01-21

It was released on 02-02-2022 on the ENVY Photo 7800 series printer servers and is not yet available on the product page.

If the printer is connected to the network, try updating the printer firmware as follows (Windows only):

1. On the keyboard, press the Windows and E keys simultaneously. The File Explorer window will open.
2. On the left side of the File Explorer, click Network.
3. Right-click on your printer (e.g. HPxxxxx HP ENVY Photo 7800 series) and then click on View device web page. The printer's web interface (EWS) will open.
4. Click the Tools tab, then expand the Printer Updates section, and then click Firmware Updates.
5. Click the Check Now button to install the latest version of the printer firmware.

I know this information because I own this HP printer model, the HP ENVY Photo 7830.

Don't hesitate to contact us in case of need.

Best regards,

[Forester4]

I checked and got the message that my firmware is up to date.  I'll see how it goes.  If not well, I'll just try waking up the printer before sending a print job.

Thank you all for your input.  I learned a few things.

[Mans]

Make a clarification on the information given in my previous message and you give the information:
This is because once the Web services are activated and the printer is connected to the network, the update is carried out automatically. The printer then restarts automatically to complete the update process.

@Forester4 

Hello,

Do you have the same problem and the same printer as @Navygm1?

Best regards,