As I mentioned on the other thread: don't give up that fast: gently pry out all socketed chips and re-insert them. You'll hear a cracking noise.
Then test the Amigas again, first without the trapdoor RAM.
If you see the power led activity but no sign of life for the Amiga (no screen, or a completely black one), that's means the CPU is busted and must be replaced for a working one.
More troubleshooting as you test them.
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