Black screen in GRUB via DisplayPort

Experiencing a black screen in GRUB via DisplayPort can be due to various reasons. Here are some steps you can try to diagnose and potentially fix the issue:


1. **Check Your Cable and Monitor:** Ensure that your DisplayPort cable and monitor are working correctly. Sometimes, a loose cable connection or a faulty cable can cause display problems.


2. **Graphics Driver:** Make sure your graphics driver is up to date. If you can't see anything during the GRUB stage, you may need to boot into your operating system and update the graphics driver from there.


3. **GRUB Resolution:** The default resolution used by GRUB may not be compatible with your monitor. You can try changing the GRUB resolution. To do this, you'll need to edit the `/etc/default/grub` file and change the `GRUB_GFXMODE` and `GRUB_GFXPAYLOAD_LINUX` parameters to match your monitor's resolution. After editing the file, run `sudo update-grub` to apply the changes.


4. **UEFI/BIOS Settings:** Check your UEFI/BIOS settings for anything related to graphics or display. It's possible that there's a setting there affecting the DisplayPort output.


5. **Try HDMI:** If possible, try connecting your monitor via HDMI to see if it's a specific issue with the DisplayPort connection.


6. **Monitor Compatibility:** Check if your monitor and graphics card are compatible with each other. Some older monitors or graphics cards may not support certain combinations of resolutions and refresh rates over DisplayPort.


7. **GRUB Console:** If you still can't see anything, you might need to enter GRUB's command line interface. Press `c` when the GRUB menu appears, and then you can manually set the resolution or other settings if necessary.


Remember to back up any configuration files you plan to edit, and proceed with caution. If you're not comfortable with these steps, it's a good idea to seek help from a knowledgeable friend or a professional.

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