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Red vertical line.

I have a HP flat panel 25" monitor with a annoying red thin vertical line running down it, any solutions?

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Re: red vertical line.


I will give you a small step through which you would be able to know whether its a hardware or its a software issue.

You need to log in to the BIOS. Do not change anything in the BOIS just check whether you have that red line in the BIOS.
If you see the line while you are in the BIOS, that means its a hardware problem and you need to contact the manufacturer (In this case HP ). You should get a replacement if its under warranty.

If you do not see the red line in the BIOS than it is a software issue and you need to start with reinstalling the Display drivers.

Note : - Steps to go to BIOS. ( Dont change anything in BIOS )
Turn off the computer
As soon as you turn it on start tapping the key "F2". ( "Del" in some brands).

Hope that will give you a good insight.


Posted on Nov 29, 2007

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If it does, then you will have to run the monitor's self-test function by turning it on with the data cable (the one that does NOT connect to the power outlet) DISCONNECTED from the computer.

If the line still appears, then the monitor is faulty & cannot be "repaired". Usually, the entire LCD module is replaced.

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Please rate this solution if it has helped you.
Thanks, Gary

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Laptop is HP zd8639ea 17" screen. A thin vertical line of very small flashing dots has appeared in the centre of the screen. How to get rid or is it replacement screen time?

Hello Dave 1011

There's a (very) slim chance it's a cable issue. More than likely, however, it is, as you suspect, the monitor.

If you're handy w/ tools and such, you can replace the monitor yourself. It'll cost at least $225US so, shop around for a good deal. (Aside from the motherboard, the monitor is the most expensive part of your laptop.)

You can run a test of your video to confirm the problem. However, when the issue is localized on the screen like that, that's a red flag that your problem is hardware.

For now, you can connect an external monitor to your laptop. In fact, that's the best way to pin down the problem to the monitor (or cables connecting to the monitor). Do this before shelling out the bucks for a new or refurbished monitor.
If the problem persists while using an external monitor, then, the problem is still likely to be a hardware issue - but it isn't your monitor. The issue is in your video circuitry. Now you're talking about a new motherboard.

I also recommend you find the product service manual for your laptop and follow the steps for disconnecting the monitor from the laptop. Then, reconnect it. See if there are any changes in the symptoms. If you need help w/ this, just let us know.

Please, let us know if this was helpful for your or, of course, if you have any further questions.

Thank you

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