Problem with horizontal lines across screen on boot

Dell Inspiron i5 laptop
Intel HD Graphics 4000

I am posting here as I'm not techie enough to know if this is definitely a graphics issue.

For a short while now there have been multicoloured lines, though mostly pink, appearing across the top half of the screen when booting up.

They are quite random:

Sometimes there is a narrow band of lines, sometimes a wider band.
Sometimes it's just one quick flash of lines, another time they appear several times, another time not at all.

The lines only stay onscreen for a second or two, and always disappear before the login screen appears.

We have run Dell's SupportAssist to do a thorough check of the laptop, and this is not indicating anything is wrong with the laptop, except the battery.

I'm looking for advice - as simple to follow as possible please - on how to check this out further.

Thanks

You could try and run a LCD built-in self test:
https://www.dell.com/support/kbdoc/e...-a-dell-laptop

If you don't see the lines described in the test then you know it is not caused by the LCD, or it's cable to the LCD which could be damaged.
If it is in windows you could try and change it's refresh rate. Have you tried hooking up an external monitor to your laptop?

Other than that I would consider heading to the drivers page and re-installing its driver:
https://www.dell.com/support/home/en...driverid=w1ppw

[QUOTE=dekayd;2139300]You could try and run a LCD built-in self test:
If you don't see the lines described in the test then you know it is not caused by the LCD, or it's cable to the LCD which could be damaged.

Tried the built in self test, all okay. Booted into safe mode, no lines.

If it is in windows you could try and change it's refresh rate. Have you tried hooking up an external monitor to your laptop?
No external monitor available to try.
Other than that I would consider heading to the drivers page and re-installing its driver:

Tried to update the driver from your link, but got an Access Denied message during the instal, despite using an Admin account. When we went into Dell to update the driver, it gave an AMD Radeon driver, but the laptop doesn't have Radeon, it has Intel HD 4000. Can you suggest where to find the correct driver please, the one that is shown in Device Manager is from 2015.

[QUOTE=SaggyMaggyPoo;2139648]

dekayd said:

You could try and run a LCD built-in self test:
If you don't see the lines described in the test then you know it is not caused by the LCD, or it's cable to the LCD which could be damaged.

Tried the built in self test, all okay. Booted into safe mode, no lines.

If it is in windows you could try and change it's refresh rate. Have you tried hooking up an external monitor to your laptop?
No external monitor available to try.
Other than that I would consider heading to the drivers page and re-installing its driver:

Tried to update the driver from your link, but got an Access Denied message during the instal, despite using an Admin account. When we went into Dell to update the driver, it gave an AMD Radeon driver, but the laptop doesn't have Radeon, it has Intel HD 4000. Can you suggest where to find the correct driver please, the one that is shown in Device Manager is from 2015.

Support for discontinued Intel GPU. Support Options for Discontinued Intel® Graphics Products

Members.

If possible, please avoid red font in your posts and replies. It is quite difficult to read and hard on the eyes. Thanks.

CPU: 2.30 gigahertz AMD Ryzen 7 3700U would indicate AMD onboard GPU, I would suspect. Just guessing.

f14tomcat said:

Members.

If possible, please avoid red font in your posts and replies. It is quite difficult to read and hard on the eyes. Thanks.

To add, some themes on this and other forums may show Hyperlinks/URLs/clickable links in red, I'm using Flanders.

Berton said:

To add, some themes on this and other forums may show Hyperlinks/URLs/clickable links in red, I'm using Flanders.

That's true. Some themes take bright colors and really create a mess. Have to be careful. I believe it was requested by Admins not to post in bright colors.