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Windows 7: Dell E5440 laptop display will not turn off when docked

02 Sep 2015   #1

Windows 7 Enterprise 32-bit
Dell E5440 laptop display will not turn off when docked

I have a Dell E5440 laptop that recently had it's LCD panel replaced. I usually dock it and connect it to an Optoma Projector and before I had the LCD panel replaced, I only showed 2 displays when I went to screen resolution. Now, after the LCD panel has been replaced, I see 3 displays in Screen Resolution, one of them being the laptop display.

Has anyone seen this behavior before and if so, do you know how to correct it? And before you go telling me to check my power setting in the Control Panel, my power settings are the same as they were before I had my LCD panel replaced. Also, I have upgraded the BIOS and completely wiped the hard drive and re-installed Windows.

At this point in time, I'm willing to entertain any and all suggestions.



My System SpecsSystem Spec
02 Sep 2015   #2

Linux Lite 3.2 x64; Windows 7, 8.1

Why was the panel replaced?

Try to use the Identify command to find which screens are actually there.

Make sure the video firmware is autorunning on startup.

Perhaps the video driver needs to be reinstalled to adapt to the new screen, if the windows reinstall didn't cover that.
My System SpecsSystem Spec
03 Sep 2015   #3

Windows 7 Enterprise 32-bit

Hello Paul1149,

The panel was replaced because it had vertical lines running through it. I have used the Identify command and it definitely shows 3 displays whereas before it only showed 2.

The video firmware was updated after Windows 7 was re-installed. But I can always try and do it again. What's interesting is that I sent 7 Dell E5440 laptops in for the same problem. The other 6 are working just fine after the LCD panel was replaced.

This problem is driving me insane!

Thanks for your help!
My System SpecsSystem Spec

03 Sep 2015   #4

Linux Lite 3.2 x64; Windows 7, 8.1

I would go into Device Manager and look for monitors. Go up to View menu and check Hidden Devices. Maybe a tech plugged in a monitor while it was on the bench.
My System SpecsSystem Spec
04 Sep 2015   #5
Chris M


The system board is likely dead and needs to be replaced (or reflowed, if possible). There's nothing you can do other than take it to someone that can replace it or repair it for you (unless you know how to do this yourself).

Sorry Gilligan! You can contact Dell, but if you're out of warranty, they may not do anything for it.

Latest Dell Laptop Price
My System SpecsSystem Spec
08 Sep 2015   #6

Windows 7 Enterprise 32-bit

Thanks everyone for all the suggestions!
My System SpecsSystem Spec
08 Sep 2015   #7

Windows 7 Ultimate x64 SP1

Could you post a screenshot of Screen Resolution please?

Can you select the 3rd monitor and disconnect it from the dropdown menu?
You can also try Win+P menu to switch between displays.
My System SpecsSystem Spec

 Dell E5440 laptop display will not turn off when docked

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