Quoted from DumbAss:

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This is because the game cannot see any of the optos (they are disconnected). It is expected. Enter test mode and select any switch test (edges or levels). Note which switches are closed (by default). You are looking for entire rows / columns or patterns. If you cannot enter test mode then you have a bigger problem that requires the CPU board to be repaired (or replaced) first. Swapping in a known good CPU board can help diagnose and isolate.
As mentioned it's likely the CPU board is the cause of all your problems but it is also possible that you have another problem that is being masked by this problem. You can differentiate (or exclude) that by swapping in a known good.