Using an iMac as a Monitor Is More Complicated Than You Might Think
Apple iMac (27-inch, September 2013) review: New processors and faster Wi-Fi for Apple's slim desktop - CNET
Repurposing an Older iMac As a Monitor and Server - Stephen Foskett, Pack Rat
need new external display for 2013 imac 27" | MacRumors Forums
macOS: How to Use Your Old iMac as an External Monitor- The Mac Observer
Using second iMac as monitor - can I still access its drive? | MacRumors Forums
iMac (21.5-inch, Late 2013) - Technical Specifications (HK)
Can someone tell me what is broken here ? This is my late 2013 IMac. It stopped showing things a couple days ago but an external Monitor shows everything. The screen is
How to Use External Monitors With Mac Laptops and Desktops
Using second iMac as monitor - can I still access its drive? | MacRumors Forums