Amiga 2000 video problem

[magnetic]

Either your A520 is PAL and your using ntsc or vice versa. A2000s DO NOT change pal/ntsc with just jumper its the a4k that has that feature. Your problem is def PAL/NTSC

[magnetic]

I have the same problem
Just bought an Amiga 500 with A520 which works fine, colored output.
But when I connect it to my Amiga 2000 rev6, it gives me grayscale output

Wrong agnus version...

[magnetic]

if you have an ntsc a2000 get an ntsc a520 dont hack the motherboard..