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OK, thank you Duke! I´ll try to find a known good Display for test. Maybe even HDMI is only working when OS is fully loaded. Ohhh, i posted this twice.....hehe

Ok, thank you Duke ! I´ll try to find a known good Display and try my best. Maybe even the HDMI is working only when the OS is fully loaded

Ok, but what about the fact that there is no HDMI and DP output?

i already tried this with disconnected internal LCD. No screen

If the LCD is bad then i would have a picture on HDMi or DP? Am i right?

Thank you Duke! Yes, i´m 100% sure. The Apple logo lit up.

First i want to say that this forum is awesome. Thank you Duke!!! I am working on a 820-3787 board When i start the machine i got no video. The backlight is there. The machine is booting but i cannot see a picture. When the machine boots i can hear a sound when pressing the enter key for...