Also be aware that the several processor boards may need diffrent flashcards.
Roughly said there are pre, and after release 9 flash cards. After rel 9 they are 8mb or larger ATA cards.The tn2402requires ATA cards
The flashcard holds your config and translations.The translations need to be the right version.
You should be able to start the system without a flash card, and login with a default craft login, but it won`t have any of your settings, or licenses, and most features will be disabled. If you system does not boot without a flash card, you may have a defective, or corrupted processor board, that needs to be replaced, or if you are lucky reflashed with an `orange card`