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Hi, I succeeded clean installing Catalina on my HP Desktop. Still, the display control panel offers NO options at all. I have a Radeon HD6870, I even replaced it with a an Apple/Radeon GP : same result. In both cases "About this mac" shows : 3 MB vram !... Any idea ?

I'm just hacking a : HP Pavilion p6710fr (Motherboard MS-7613 Iona-GL8E) Core i3 550 8GB RAM Mountain Lion I followed the 10.8 (Moutain Lion) instructions. (NB : Using the rear USB connectors, not the front). It all went fine. Everything fully operational (except WiFi). Of course, I used the...