Display is no longer visible on the MBPro.

[MeteoLeudal]

Hello,

For quite a while my MBPro has the following problem. After fifteen minutes the display is no longer visible on the MBPro.
After reboot it is there again but as mentioned after a quarter of an hour gone again and I see an black display. Also after factory reset no change. Who knows what is going on.

Thanks,
Peter.