yeees, I did do the usual stuff - trouble is it was me mums' old PC, so its a bit long in the tooth - as you robably guessed by the gfx card!
List all modes showed a lot of modes, but they were all in a 4:3 or 5:4 ratio.
I'll try the .inf tip - I'd forgotten about those !
It is a new monitor, so it should do PnP but that all depends on whether the display driver does...