Linux can't see anything anymore OR can't boot with wrong graphics setup

After you have "hacked" around with your wrong graphic drivers. Or you just wanted do fiddle around new setups for the screen.

You boot again.
Now it hangs....
OR it shows nothing anymore.

Take a boot-able disk / stick and boot into that linux.

Search for the file on your drive of "the other defective linux on the machine".

/etc/X11/xorg.conf

Copy / paste this over everything:

Section "Device"
   Identifier   "Configured Video Device"
   Driver      "fbdev"
EndSection

Section "Monitor"
   Identifier   "Configured Monitor"
EndSection

Section "Screen"
   Identifier   "Default Screen"
   Monitor      "Configured Monitor"
   Device      "Configured Video Device"
EndSection

Now you can reboot your PC and it will start into a default resolution. Change it from there to whatever you like.
I was so glad I've found this tip!