yes this is the big issue for me not getting an iMac already. I could with a new monitor and could be tempted to get am iMac to go with my MacBook Pro & Desktop but without HDMI input it's useless as I don't have space for an iMac and a second monitor. It can't be that hard to do and the cost can't be much for a £1000+ product.Needs external HDMI input if that's the case. Really needs to act as a monitor.