2007 IMac DVI port, can’t find the correct cable?

cursed_beans wrote:

I have a 2007 iMac … I was hoping to use it as a monitor

You can't. The mini-DVI port on that 2007 iMac is only for output. It's to let you attach an external display to the iMac. One with a maximum resolution of 1920x1200 pixels (digital) or 2048x1536 pixels (analog).

i have brought a mini display to hdmi cable, however the mini display is the correct shape but about 2mm too small around all sides.

Mini DisplayPort and Mini DVI are different things.

how do I connect my MacBook display to my IMac if this cable no longer exists anywhere online? I have spent weeks on and off looking for the cable.

You may still be able to get a few Mini DVI adapters, e.g. StarTech – Mini DVI to HDMI Video Adapter for MacBooks and iMacs – M/F . This adapter might let you use a 1080p TV or computer monitor as a second screen for the 2007 iMac. It would not let you use the 2007 iMac as a display.

Not going to happen. Assuming your MacBook is running a supported version of macOS, it can not use a Mac as a display even if that machine supports Target Display Mode.

it's miniDVI Mini-DVI - Wikipedia

the cable in your image is mini-displayport which will not fit in a mini-dvi connector

Amazon.com: StarTech.com Mini DVI to HDMI Video Adapter for Macbooks and iMacs- M/F - MacBook Mini DVI Adapter - Mini DVI to HDMI Cable (MDVIHDMIMF) : Electronics

more

Amazon.com : mini dvi

You can only use your iMac as a monitor in *very* specific circumstances. Read this carefully:

Use your iMac as a display with target display mode - Apple Support