Cables like the one you need are sometimes to be found on EBay using key word Apple DVI cable 20 LCD or Apple DVI cord 20 and in combination of words like: Apple dvi replacement 20 inch, Apple dvi cord cinema 20. I see them all the time going for around 30 to 40 dollars. Make sure that you have the exact same. The cable replacement procedure are straightforward, nothing to solder, just remove and replace, be very careful not to force taking apart the connectors at the board ends. I fixed many clear, acrylic models, but I do not have any experience on the newer aluminium models so I cannot say. Use proper size allen keys and philips tools to do it and take time. You can also Google something like DVI monitor cable replacement procedure Apple 20 LCD. Give it a try and see. I have a friend who had the cable of his 17 inch monitor professionally replaced and the price was more than half of the monitor itself. I don't think anyone stockpiles parts but you can also try buying the same monitor with a broken screen and have many parts left over in case of future need. I saw a 20 Apple lcd with a cracked screen sell for 92 bucks as is. Another Idea I had but didn' do it yet was to get a new DVI cable usually sold as a regular DVI 6 footer at both ends at any computer store and cutting it in half and using an ohm meter and marking each pin with the color coding corresponding with the broken one. The colors on both cables are probably different but it is the pin matching that is important. One you know which pin is for which wire then all you have to do is put them together ( soldering is preferred but not absolute) and tape them up. That is the cheapest way I know of. I hope I have been o some help.
