What's the best gaming PC for Amnesia

[Mudbill]

Oh, for some reason I thought you had a monitor. Must've been confused with the All-in-1 PC thing.
Your old monitor will work, I'm fairly sure. Video ports haven't been abolished in some time. Old monitors usually have the VGA port (a blue trapeze shape with 2 screws). Newer ones usually have HDMI and/or DVI (which is similar to VGA, but white with a square shape and a little flat pin on one side).

Anyway, monitors are pretty cheap too. I'm sure you can find something. I recommend a 24-inch 1080p one (personally I have a 27-inch 1440p, but that's more than enough).