KrisJ wrote on Sep 3^rd, 2018 at 10:42am:

How do you perform setup 4 (CDU) if you chose C&D in step 3 which makes BAT off and CDU unpowered?

No power=No CDU obviously.

If you want to set the C&D state as the default state:
1. CDU: Menu >> Setup >> Options >> Page 2 >> Load Default Panel State: On
2. press EXEC
3. Rename a copy of the ...p3dv4\Captain_Sim\757-III\panel\basic\COLD AND DARK.cfg file into DEFAULT.cfg.
4. Replace original ...p3dv4\Captain_Sim\757-III\panel\custom\DEFAULT.cfg file with the file you made in #3.