MBA 2011 Internal Monitor stopped working

Hello Community,
"over night" the internal display of my 2011 MBA stopped working. :-( External Monitor and and all other things are okay, the background light is on too, but there is nothing on the internal display.
Are there any tipps to get this thing to work properly again?
Thanks in advance.

Reset the PRAM > Resetting your Mac's PRAM and NVRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.
Note: if you are using a wireless keyboard and the Hardware Test and/or Pram reset is not working, then you may need to use a USB keyboard.
Also see > Intel-based Macs: Using Apple Hardware Test
and > Apple - Support - iMac - Service FAQ if the Pram reset does not solve your problem.

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