using a mac as a monitor? Home › Surface Accessories › using a mac as a monitor? This topic contains 1 reply, has 2 voices, and was last updated by tim 2 years ago. Author Posts February 19, 2016 at 1:15 pm #2062 mick ReayParticipant Hi I’ve recently bought a surface 3 as a trial for my business, if it works then I’ll probably roll out more of them. One thing that would be advantageous is if I could use a lead to use my iMac as a monitor. Looking at Apple it seems it can be done from the Apple side, using a thunderbolt cable as an input. Can the USB port on the surface be used as an output for it’s screen? February 19, 2016 at 1:17 pm #2066 timKeymaster I never tried it but, if the iMac supports a thunderbolt input, I don’t know of any reason it wouldn’t work. Author Posts You must be logged in to reply to this topic.