Grid EF44 shows only red lights, no reaction, no visibility

Hi, i don’t know why or when it happend but my EF44 is not working nor visible anymore and shows only red lights.
I tried the same cable and others. I have a PBF4 which works fine. Changed it with the EF44 = red lights . Tried the Bios-Login , no respond just the red lights.
What is this? Why is it?
How can i “reset” the EF44 (it has the sign on the Plate), whithout been seeing in Editor or Windows 11 ?