To fix a black screen issue on Xiaomi Mi Note 10:
# Perform a forced restart by pressing and holding the power button for about 10-15 seconds until the device restarts.
# If the issue persists, ensure the device has sufficient battery charge or connect it to a power source.
# Try booting into Safe Mode by pressing and holding the power button, then long-pressing "Power off" until prompted to enter Safe Mode. If the screen works in Safe Mode, an app might be causing the issue.
# If the problem persists, consider factory resetting the device through recovery mode. Backup your data before performing this step.
# If none of the above solutions work, contact Xiaomi customer support or visit a service center for further assistance.