If your phone's screen is black but the phone is still working, try these steps:
1. ***Force Restart***: Hold down the power button and volume down button (or the appropriate combination for your phone model) to force a restart.
2. ***Check Connections***: If you're comfortable, open the phone and check if the display connectors are securely attached.
3. ***Inspect for Damage***: Look for any visible damage to the screen or connectors that might need professional repair.
If these steps don't work, you may need to replace the screen or seek professional repair services.