I have a 3000 series with a 68EC030 on an SE ROM, but I think I shorted out the logic board when I tried replacing the failing hard drive years ago (it won't go past the initial kangaroo logo power-up screen).

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On the Laptop Model 125 that symptom usually indicates that the on-board EEPROMs are corrupted. Does the 3000 series have a "system installer" which modifies the OS but also spends a moment with a message similar to "Writing boot code to EEPROMs" or some such?

I don't even know if the 3000 series has on-board EEPROMs...