[F. W. Kooistra]

Hi
This has nothing to do with the card or the driver
But the monitor has no vga mode.

Your procedure is correct

I would keep the old monitor ( or any old monitor for BIOS setup etc.
etc.
I do not know if your card has a dual output :
In that case keep the standard monitor on screen :0 The apple on screen :1

or you feel like adding a simple card for text and bios stuff - clumsy too

One could edit the default mode of the Video card to be a standard mode of the apple screen ... Nahh do not even think about that