« on: December 12, 2010, 06:48:59 PM »
- install cgx4 from cd (dont select any gfxcard yet!)
- install cgx4.3 rc5 update (tick the Bvision option, use default tooltypes)
Thats all you need to do software-wise.
The most obvious answer would be that you didnt set up your monitor the way you should. Look up its specs and choose the right one when installing CGX.
If you still dont get any output, try holding escape while booting. Do you get output (bootmenu) now? Then at least that mode is working. (though this also depends on your flashupdate). If Im not mistaken you can use this resolution in workbench and then use cgxmode to set up other display modes.

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Amiga 1200 (1d4) Kickstart 3.1 (40.68), Elbox Power/Winner tower (450w psu), BlizzardPPC 603e+ @240mhz & 060 @50mhz, 256MB, Bvision, IDE-fix Express, IndivisionAGA, 120GB IDE, cd, dvd, Cocolino, Micronik Keycase, PCMCIA Ethernet, Ratte monitor switcher, Prelude1200, triple boot WB3.1 / OS3.9 / OS4.1, Win95 / MacOS8.1