BitLocker post screen corrupts

Hi Jessie Tsai

Welcome to Microsoft Community

Glad to be here assist you.

According to the category you posted / Windows 11/, we can know that your problem is "BitLocker interface is not displayed completely when extending external display through Dell computer" If my understanding is wrong, please feel free to correct me.

Due to lack of information and data limitations, we may need to point to detailed information.

1. Whether the current secondary screen display is incomplete is only behaves like this in the BitLocker interface. Does everything display normally when entering the desktop.

2. At the same time, could you please provide the resolution/interface standard/brand model of the external monitor. For example / DVI interface / VGA interface / HDMI interface / DP interface.

3. In addition, could you try connecting this monitor to another device to see if the same issue occurs. Does the computer behaves like this when connected to other external screens?

The above three scenarios help us to study this problem better, and the clues you provide are the key to solving the problem.

We always look forward to your reply.

Chandy| Microsoft Community Support Specialist

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* Beware of scammers posting fake support numbers here.

Hello Chandy,

Thanks for your help and you are correct, my problem is "BitLocker interface is not displayed completely when extending external display through Dell computer".

Please refer to following for my answer:

1. Whether the current secondary screen display is incomplete is only behaves like this in the BitLocker interface. Does everything display normally when entering the desktop.

   [Jessie] The failure only exist in BitLocker interface, everything is working fine after I enter desktop.

2. At the same time, could you please provide the resolution/interface standard/brand model of the external monitor. For example / DVI interface / VGA interface / HDMI interface / DP interface.

   [Jessie] The monitor model: Dell C2422HE, resolution: 1920x1080, interface: HDMI/DP

3. In addition, could you try connecting this monitor to another device to see if the same issue occurs. Does the computer behaves like this when connected to other external screens?

   [Jessie] Yes, I have also tried other model external monitor Dell U3023E, resolution: 2560 x 1600, interface: HDMI and the issue persists.

Jessie Tsai

Hello Chandy,

Any idea about this issue?

Thank you.

Jessie Tsai

Hi Jessie Tsai

Sorry for my late reply. After a round of testing, could you please try to use HDMI-HDMI to connect your second monitor? Because of the particularity of DP cable, the motherboard may still give priority to signal on your laptop screen when you start the laptop.

At the same time, please press and hold Windows+I to open Settings > On the tab of multiple displays Select to set show only on 2

In addition, please try going to system > go to recovery > select advanced

boot > reboot now > enter the advanced boot interface > select troubleshooting > click advanced options > enter the UEFI firmware setting interface > The following BIOS interface here is based on ThinkPad BIOS, and you can refer to Dell's method of entering the BIOS interface to find this options,as shown below:

Disclaimer: Microsoft provides no assurances and/or warranties, implied or otherwise, and is not responsible for the information you receive from the third-party linked sites or any support related to technology.

If you are going to modify BIOS Settings, please back up all your personal files first to ensure you do not lose data.

In general, the display before entering the Windows login screen (including the BitLocker screen) should depend on the device's BIOS. Or as mentioned by an engineer in the Dell Community below “it only works that way if an actual external power button was used to power the system on, as in the case of a docking station.” Click here for reference

Disclaimer: This is a non-Microsoft website. The page appears to be providing accurate and safe information. Watch out for ads on the site that may advertise products frequently classified as PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.

If there is any update, you are welcome to reply again.