switchable DVI output?

[Doctor]

I initially posted this in the first topic, but a friend suggested that maybe I try this topic

hi,

I have a situation and wondered if anyone could help please.

I currently have the original Mac Pro with one vid card. I would like to buy a second card, but the only ones available are highly expensive and it's impossible to find one of the old ones.

I need to be able to make one of my DVI outputs changeable from monitor B to monitor C while leaving my monitor A constant.

The question I have is: is it possible to use a KVM switch to switch between one or the other without blowing up my computer and monitors?

Thank you very much.