At times the words and letters start to get shaky and the screen will flash off and on

[FranMcMc]

At times the words/letters get shaky and the screen will flash on and then darken.  I usually have to shut the system down and them restart.

[Garp_senchau]

@FranMcMc, Welcome to HP Support Community,

Thank you for posting your query; I’m here to help by guiding you through steps to resolve this issue

Here are some steps you can take to troubleshoot and resolve these problems:

1. Update Display Drivers

• Go to the HP Support site.
• Enter your product name or serial number: HP Envy 17.3 inch Laptop PC 17-da0000.
• Click "Submit."
• Select your operating system, then expand the "Driver-Graphics" section.
• Download and install the latest drivers for your display/graphics.

2. Update BIOS HP Consumer Notebook PCs - Updating the BIOS (Basic Input Output System) (Windows) | HP® Support

• Navigate to the HP Support.
• Enter HP Envy 17.3 inch Laptop PC 17-da0000 and go to "Software, Drivers, and Firmware."
• Select your operating system.
• Expand the "BIOS" section and download the latest version available.
• Follow the instructions to install the update.

3. Perform a Hard Reset

• Turn off the laptop.
• Disconnect all peripheral devices and remove the power adapter.
• Remove the battery (if removable).
• Hold the power button for about 15 seconds.
• Reconnect the power adapter and battery, then turn on the laptop.

Also, refer to this guide for further troubleshooting steps: HP Notebook and All-in-One PCs - Troubleshooting screen issues (Windows 11, 10) | HP® Support

I hope this helps.

Please feel free to reply here if you have any questions or if you need further clarification on any of the steps. 

Take care and have a good day. 

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Regards,