Well - firstly - I would like to thank you guys for your advice.
obitus1990: I see you're using machine pin sockets on some of the ICs while using dual wipe DIP sockets on others. Make sure your chip pins are not perfectly straight when using those machine sockets. They need to flare out from the sides of the IC a little bit to put tension on the socket, else poor contact will result. I hate those things, and, in my opinion, they should only be used with machine pin headers since that's what they're designed for. This is use of a "square pin in a round socket" as far as I am concerned. I had a 68000 CPU in an A500 I thought was bad recently, but, it was just making poor contact to a machined pin socket that had been placed in there during what I assume was some previous repair.
Well - it's quite possible that the problems I am seeing are indeed because of a poor socket connection.
I compared the picture that you posted of your build vs. mine. I have in fact got turned pin sockets on four locations where you have dual wipe DIP sockets. Specifically U102, U200, U201+ U800, i.e. the sockets for the four custom chips: Gary, Paula, Denise and Buster. I chose turned pin because I was having problems sourcing 48 pin dual wipe DIP sockets. The supplier that I used only has dual wipe DIP sockets with up to 40 contacts. I figured it would probably be okay. Looks like I may have been incorrect.
I guess I will see if I can find any from a different supplier.
nadoom: I've started building my a2000 mobo now.
Hopefully it will work first time so I don't have to learn how to fix it
. @grshaw when I built an a500++ last year I got a green screen also one of the ram chips was not firmly seated. Worked fine once I made sure they were firm.
Glad to hear it.
I did try re-seating the RAM chips. I am wondering if the RAM I bought from eBay is not good. I will try taking out and replacing with some known good chips.
Do you have a url for this discord server? I will join this if possible.