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I messed up something in nvidia-settings, not sure what and after reboot, echo $DISPLAY gives nothing.

I tried to export it manually export DISPLAY=:0.0 After reboot, display is still empty, i tried echo DISPLAY is $DISPLAY, still nothing.

Then i deleted nvidia and installed nouveau, gives me same black screen or computer manufacturer logo.

/etx/X11/xorg.conf

section "screen"
    Identifier  "Screen0"
    Device      "Device0"
    Option      "UseDisplayDevice""none"

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