PB 540 with dark corners on the screen

Hello, after being turned on for about 20-30 minutes the corners on the screen gets darker and darker. The computer has not been turned on for atleast a year but seems otherwise to work ok.
What causes this problem ? At startup all is ok = screen is normal.
Thanks for any tip I can get / Hans

Puuuhhh. Hey pitorek, its really not easy to say if its a display malfunction.
But I think this question could be answered by a authorized technician.
I think you should contact the service partner in your country (I assume youre from Poland ;)) and explain the guys the situation. I think you should send him this screenshot.
Possibly you will get a replacement. But I dont know if it could be a display fault or fl inverter or something different.

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