l'écran ne s 'allume plus malgré le changement du cable all in one

malgré le remplacement du cable all in one l’écran reste noir mon écran fonctionne avec un mac mini.les usb de l’écran fonctionnent ainsi que la camera. en screen sharing avec un autre mac je vois que tout est normal : son ,micro ,camera, clés usb

a few days ago i change the location of my display ; the display worked perfectly with my macbook air and my mac mini ,both have a thunderbolt connector.

after changing location it was impossible to light the screen but the usb ,camera, sound is OK

To have some information i connect my mac mini with another iMac with a program named” screen sharing” and every thing is alright but no screen.

i thought it was a problem with the all in one cable and i chanced it with a new one but no succes

so was can i do now ?