Black screen after disabling CSM

Possible solutions

Choose the method that matches your situation. Start with the simplest suitable option and check the result. If the problem is fixed, you do not need to continue with the other methods.

1. Returning to the previous CSM setting

   If you have a BIOS image, please return only the modified option according to the manufacturer's instructions.

   Steps to follow

   1. Save your files and BitLocker recovery key before replacing BIOS.
   2. Find the exact CSM, Secure Boot or PTT/fTPM section you need in the model manual; the option names are not the same on all computers.
   3. Open BIOS as in the manual, take a picture of the current setting. Change only the option provided in the manual; CSM returns need to know the previous value.
   4. Use the save command shown by BIOS and test the startup. If the menu doesn't match or you don't know the previous setting, don't guess it; Do not delete TPM and Secure Boot keys.

2. Using UEFI compatible graphics

   If the GPU does not support the required UEFI mode, use a compatible output or specialist check; Do not overwrite GPU BIOS blindly.

   Steps to follow

   1. According to your exact computer and GPU model, open the official instructions for UEFI/GOP or disk boot mode.
   2. Write down the current mode and get a copy of the files and the BitLocker key.
   3. If a GPU compatibility change or disk conversion is required, pass the models and information to the craftsman; do not follow the instructions for another model.
   4. Until preparation, use the previous mode that worked if you can safely revert to it. This method does not have a simple one-size-fits-all button for all devices.