No picture, changed logic board
Hello I have this imac model (a1224) which has ati radeon 2600hd. I used to have no picture just power on (diagnostic leds only the first was ON). I changed the logic board now I have 3 out of 4 leds ON but no picture even on VGA out and also now I have the chime. I think that the problem might be from the VGA board. After changing the logic board is there any necessary adjustment that needs to be done or it will just work?
Is this a good question?