Just Yesterday i got my MK3 Card and installed in in A1200 as per instruction, i pushed it hard to lisa chip so i can lift board by pooling the card.
So after install it worked, sort of, It took longer than i remember to show kickstart screen but it did, than i disovered that floppy drive is not booting floppies,
well i turned off the Amiga, i refitted the FDD drive and than Magic on screen started, I powered on the amiga with hdmi output and.... greay wierd screen, no Indvidual computers logo on start nothing, i have stripped apart amiga try to run just with board, sometimes it showed the logo but than didnt show Kickstart screeen. After all i decided to double check if amiga is still working at all, I have removed the MK3 putt all togheter and started amiga, put workbench disk and it worked (well sort of i dont have RGB cabel yet so i could not see anything) but at least i knew amiga is alive. On last test i did, i conntected the Amiga to a TV (before it was Samsung monitor) hopeing that maybe something happend and MK3 is sending signal that monitor is not able to read, but.. the same on the Sony Bravia TV, last thing i check was live menu and that works but chaning any values just changes the grey to black and thats it.
I checked the Lista chip all seems ok, card is fitted well so i am running out of ideas. I just started setting this amiga up, so its basic A1200 Magic with original black PSU, no extensions.
Here you can see the pictures :