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HP Envy screen flashing black with one vertical and one horizontal white bar, lasting 1 second.

HP Recommended
Microsoft Windows 10 (64-bit)

I have been having issues with Microsoft office being glitchy, sometimes my excel sheet moves the data to a diff column, or duplicates a line item. If i click a diff tab and back again it corrects, word freezes and seems to run slow as well. Today my screen would flash black and display a white horizontal bar and a white vertical bar like a backwards L. 

This would last 1 second and disappear.  

The computer says it is up to date and the virus protection isn't flagging anything either. I think the computer functions slow but I am also impatient. Any idea what is going on? Does this sound like a virus?

Thank you for any suggestions! 

HP Support Agent
HP Support Agent
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Message 2 of 2
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HP Recommended



I reviewed your post and I understand that the computer is running slow you are facing issues with the display.


Don’t worry, I assure you I will try my best to get this sorted.


I recommend you boot to BIOS and then check whether you are able to duplicate the display issue in the BIOS.


Meanwhile, update the BIOS and the graphics driver from the below link and check if it helps.


Let me know how it goes and you have a great day!


P.S: Welcome to the HP Support Community 😊


If you wish to show appreciation for my efforts, mark my post as Accept as Solution. Your feedback counts!



Stay Home – Stay Safe

I am an HP Employee

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