That’s what we shall uncover in this post. Why not use iMac as an external monitor for your PC, or other Mac computers? If you did that, it is a big pity that you miss the large screen. IMac, as the all-in-one desktop computer, has been the favorite computer for many users, and 4K retina screen is one of the highlights.Īs time goes, old iMac may be put in the room corner.