No, you can use Mac monitors on PCs. The problem is, you have to be in Windows to get the right video mode for the monitors. I think most Unix clones will let you switch the console video mode, but I don't think you can do it under DOS. Fixed frequency video cards that actually will display all your boot up info and work under DOS aren't that hard to come by--just pretty expensive. I've seen them go for $50 on eBay, though, and I just grabbed one from another source for $40.