PLEASE READ! 17" Diamondtron - Apple Studio Display 17 (M6496) 21" Trinitron - Apple Studio Display 21 (M4868) 2 Apple Studio Display CRT monitors available. One is a Diamondtron 17" CRT and the other is a behemoth 21" Sony Trinitron CRT both made by Apple. The 21" is working but needs a cap replacement specifically for the horizontal deflection circuitry. The 17" - When the power is on there is a black screen and a clicking (it might be the flyback circuitry). --- The 21" turns on and I get picture but the image is centered on screen. The horizontal geometry needs realignment. It's very like that the horizontal deflection need new caps replaced. I've also been able to successfully change resolution and adjust geometry settings in Linux. It's just that it isn't filling the entire horizontal width so everything points to aging horizontal deflection circuitry. I wanted to work on them myself but have been unable to due to time constraints. They can be brought back to their former glory but require the right person with the technical know how. Both monitors could benefit from someone knowledgeable in CRTs and general electronics to recap where needed. I have done a lot of research on the monitors and can also supple technical documents. If you're interested, message me and make me an offer. The 21" with a cap replacement usually goes for between $700-1200. I'm willing to let them both go together to the right person for a lot less. Apple Studio Display 21 (M4868) https://crtdatabase.com/crts/apple/apple-studio-display-21-m4868 Apple Studio Display 17 (M6496) https://crtdatabase.com/crts/apple/apple-studio-display-17-m6496