Hello victoriawicz,
If the screen is not working, you can try doing an SMC reset with these steps:
1. Shut down your Mac.
2. On your built-in keyboard, press and hold all of the following keys. Your Mac might turn on.
• Control on the left side of your keyboard
• Option (Alt) on the left side of your keyboard
• Shift on the right side of your keyboard
3. Keep holding all three keys for 7 seconds, then press and hold the power button as well. If your Mac is on, it will turn off as you hold the keys.
4. Keep holding all four keys for another 7 seconds, then release them.
5. Wait a few seconds, then press the power button to turn on your Mac.
Reset the SMC of your Mac
If the screen still doesn't work, you can find available repair options for the computer here: Mac Repair & Service
Cheers!