how to do a monitor factory reset on all-in-one HP Touchsmart 520 PC

[AndreBenedict]

how to do a monitor factory reset on all-in-one HP Touchsmart 520 PC without physical monitor setting buttons
https://support.hp.com/ca-en/document/c00791958
the PC does not start up,  instead, the monitor cycles full screens of black, red, green, and blue color

[Echo_Lake]

@AndreBenedict
Thank you for posting on the HP Support Community.

I have a few troubleshooting steps we could try to fix the issue:  

1. Open the onscreen display.

2. Use the plus (+) and minus (-) buttons to highlight Advanced Menu.

3. Press the Select button to open the Advanced menu.

4. Select Factory Reset from the Advanced menu.

5. Select Yes.

6. Press the Menu button to close the onscreen display.

   The monitor should show the correct behavior when going into standby mode.

Hope this helps! Keep me posted for further assistance.
Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

[AndreBenedict]

thank you for the reply

unfortunately the computer does not even start up

when I press the power button, the monitor starts flashing black/red/green/blue as described here :
https://support.hp.com/ca-en/document/c00791958

unfortunately I do not have any monitor select buttons as mentioned in the thread

please help me
thank you so much

[Echo_Lake]

@AndreBenedict

Thank you for posting back. 

This sounds like a hardware related issue,

I would request you to reach out to our Support and our Support Engineers should be able to check the available service options in order to diagnose the computer physically. HP Support can be reached by clicking on the following link: www.hp.com/contacthp/

Please feel free to contact us here anytime you need any further assistance. Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.