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I'm trying to connect an external monitor but In settings there is no option to recognize external display- so it doesn't. I tried getting a call from Apple, but since the monitor was given to me and is old, I couldn't read the SN so the agent was unable to help.
MacBook Air 13″, macOS 14.7
Is this a 27" display? If so, be aware that there are two old 27" Apple Displays that came out around the same time, that use similar physical connectors, but that require different types of signals.
For the LED Cinema Display, you will also need to connect the USB head so that you can control brightness. There are various ways (adapters, hubs, docks) to do this.
The 27" Cinema Display was one of many Apple Cinema Displays.
The earliest Apple Cinema Displays use an ADC connector – which is a proprietary connector that carries DVI-style video, USB, and USB, and power. It's just about impossible to get ADC adapters these days. So if you have one of these displays, forget it.
Many Apple Cinema Displays use DVI or Mini DisplayPort. For these, use USB-C to single-link DVI or USB-C to Mini DisplayPort adapters, as appropriate. The 30" Cinema Displays have resolution that is too high for single-link DVI – for these, you will need an active USB-C to dual-link DVI adapter.
MacTracker shows several 20" Cinema Displays – one that uses ADC, two others that use DVI. Maybe the pictures in these articles will help in identifying the connector.
VGA, thunderbolt, and USB, I connected a c to USB to the computer and tried 2 places, to the power adapter and then to the monitor. I think the problem is the MacBook doesn’t have an option ti recognize the monitor.
I have the 20" with three heads
A USB-A connection alone will not carry video. USB on those old displays is for hooking up USB hub ports on the display and/ir letting you control brightness from a Mac.
Cinema Display to MacBook Air 2019
