Purple and Blue flashes across screen

[Blankey555]

Hello all, 
For a few months now my Spectre has had a purple and blue bar that flashes across the screen, usually along the bottom. It used to happen once a week or so and now it happens often throughout the day. The flashes only last a fraction of a second and are about two centimeters tall. Then tend to happen in clusters of 2-4 a minute for a couple of minutes every  

It isn't particularly obstructive, but it is happening more and more and I'm concerned that it is getting worse. I use my laptop for work and would like to try and fix this before it becomes a problem. Does anyone know what could cause this?

[Jeet_singh]

Hi @Blankey555,

Thank you for visiting the HP Forums! A great place where you can find solutions for your issues with help from the community! I came across your post and wanted to assist you. I understand you are having issues with the screen flashing on your HP notebook. Don't worry we'll work together to find a solution for you.

To provide you with an accurate solution, I'll need a few more details:

Did you check for any damage on the PC?

Did you try with an alternate monitor?

Have you checked if the issue persists even in the Bios screen?

Have you tried to update the drivers?

In the meantime, let's start off by performing a Hard reset on the Notebook:

Step 1: Performing a hard reset

Resetting the computer can resolve many issues that cause a blank screen. Use the steps in Performin...

If you haven't, Please try an alternate monitor to understand if this is either a hardware or a software failure, 

if the issue does not appear on the alternate monitor, you may need to replace the display assembly on your computer, 

if the issue appears on the alternate monitor/TV as well, re-install the graphics card drivers & update it from the official HP Website: Click here 

Step 3: ​​​​Boot the computer into the Bios screen and check if the screen flashes.

1. Turn off your computer
2. Make sure you have connected the power cable
3. Turn on your notebook, as it is starting press the  F10 button repeatedly

If you don’t have an alternate monitor, I recommend checking if the issue appears on the BIOS screen (restart the computer and tap on F10 to access BIOS) 

This would confirm if it's either a hardware failure or an issue with the graphics card drivers so we may reinstall and update the drivers to fix the issue as mentioned above. 

  

If the issue persists on BIOS as well, please try with a TV to identify if it's the LCD or the motherboard/video card failure, 

  

If the issue occurred after an accident (such as dropping it on the floor, liquid spilled on it, etc.) there could be a hardware failure and in such cases, you may need to get the computer repaired via HP (there could be a charge involved if the PC isn't covered by the accidental damage protection plan) 

For more assistance, please follow the steps suggested in the support document for - HP Notebook and All-in-One PCs - Troubleshooting Screen Issues (Windows 10, 8, 7)

For additional information, please visit this link: HP PCs - Blinking or Flashing Screen After Upgrading to Windows 10

  

Reply with the result of the above-mentioned steps, for further assistance. 

Eagerly waiting for your response!

I hope you have a good day ahead,

And Feel free to ask your queries as this forum has some of the best people in the world available and ready to help.

Regards,