Screen flashes at login screen, please help!

[Cae9]

This problem originally startes amount a month and a half ago when I got a pop-up saying that an update was ready for installation and that I needed to restart my computer. Of course, I immediately saved the work that I was doing and then followed the directions. When it started to boot up, everything was normal until I reached the screen where the time is displayed in the lower left hand corner, before you press any button to put in your password. At that screen, it keeps flashing on and off repeatedly for x amount time. Eventually, it stops and I am able to put in my password. After logging in, the computer runs smoothly without any issues. Can anyone tell me what I should do? Is seeking professional help necessary or is this just a windows issue?

I would like to point out that there was an issue when I checked my update history. One update failed to install: 208-11 Update for Windows 10 Version 1803 for x64-based Systems (KB4023057). It failed to install on 11/17/18 - 0x80070643

Thank you.

[A4Apollo]

Hey there! @Cae9, Thanks for stopping by the HP Support Forums!

I understand you have display issues with your laptop and the screen keeps flickering at the login page.

Don't worry I'll try to help you out.

Did you make any software or hardware changes on your PC?

Were there any physical damages on your PC?

Does the issue persist in BIOS?

Please share the product number of your PC to assist you better.

If the issue does not persist in BIOS try updating the graphics driver and BIOS on your PC.

You can try updating the drivers on your PC using HP support assistant.

Refer this article to know more information about using the HP support assistant. Click Here

Try restoring the BIOS to default and check if it helps.

1.    Turn off the computer and wait five seconds.
2.    Press the Power button to start the computer and repeatedly press the F10 key to enter the BIOS setup menu.
3.    On the BIOS Setup screen, press F9 to select and load the BIOS Setup Default settings.
4.    Press F10 to Save and Exit.
5.    Use the arrow keys to select Yes, then press Enter when asked Exit Saving Changes?
6.    Follow the prompts to restart your computer.

Refer this article to further troubleshoot display issues with your PC. Click Here

Also, try running a system diagnostics test on your PC and check if the hardware components on your PC are functioning correctly.

Refer this article to know more information about running system diagnostics on your PC. Click Here

Let me know how it goes!

I hope you have a great day! 🙂

Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.

Click the “Kudos, Thumbs Up" on the bottom right to say “Thanks” for helping!

[Cae9]

I tried following the steps that you mentioned for the BIOS and it did not help. I'd like to point out that my screen is not flickering so it is not a hardware issue. It took no damage in any way. 

[Jeet_singh]

@Cae9,

It looks like you were interacting with @A4Apollo, but he is out for the day & I'll be glad to help you out, 
I'm the Jeet_Singh & I'm at your service. 

After reviewing your post thoroughly, I understand you seems to have an issue with the screen flashes on the login screen. Don't worry we're here to help you.

As you suspect this is not a hardware issue, then it's more likely a software or driver related issue. In this scenario, let's try these steps here: 

Let's start off by performing a Hard reset on the HP Notebook PCs: 

Many startup errors and other problems can be resolved by decreasing the amount of power stored in hardware components. Decreasing stored power is sometimes referred to as a "Hard Reset". Use the following steps to perform a hard reset on a computer:

1. If Windows is open, click Start and then Shutdown.

If Windows is not open and the computer has power, press and hold the power button on the computer until the computer shuts off.

2. With the power off, disconnect the power cord from the back of the computer.

3. With the power off and the power cord disconnected, press the power button on the computer for 5 seconds. The power light indicator on or near the power button might turn on briefly but then go out.

4. Reconnect the power cord and turn on the power.

 I recommend to restore the BIOS defaults.You could restore the BIOS with this document selecting the reloading the BIOS default settings. That way it will look at the Hardware installed on the Notebook.

Once done, restart the computer and check.

Next thing, I would suggest here is to Run Windows Updates troubleshooter -

Download and install the troubleshooter from this link.

Now try to perform a Windows update:

1) In the search box, type and open Windows Updates. 

2) Check for updates. 

3) If the updates are available, click on install and restart the computer.

If the issue persists, I would suggest here is to uninstall the display drivers from device manager:

Display drivers:

Use shortcut keys Win + X on Windows 10

Select Device Manager.

Expand the entry. Right-click the problematic device and select Uninstall device.

You may need to check the option Delete the driver software for this device, and then click the Uninstall button.

Now restart the computer and then update the Bios, and graphics card drivers from our HP support website, using this link.

If the issue persists, I would suggest here is to uninstall the HP Support Assistant from the control panel and then reinstall the latest version.

Download and install HP support assistant on your PC. It should automatically download and install the latest updates and drivers for your PC.

Refer this link to know how to use HP support assistant.

For more details, please follow the steps suggested in the support document for - HP PCs - Blinking or Flashing Screen After Upgrading to Windows 10

Please perform all these steps patiently as it is critical to resolving the issue. The trick is to remain patient, please. Please note that I am not overloading you with a lot of troubleshooting steps. Instead, just like you, I am eager to ensure that the problem gets resolved. So I am providing you with more resources and information at your disposal to deal with the situation better.

Hope this answers your question.

Good luck and keep me posted about the developments. If this helps, please mark this as “Accepted Solution” as it will help several others with the same issue and give the post a Kudos for my efforts to help. Thank you and have a great week ahead. 🙂