That immediately tells me that your hard drive probably went
and this tells me the hard drive is probably trashing the bus. Happened in my 2000 Ruby iMac DV, fixed it by removing the dead drive and replacing it with some other hard drive
try checking continuity between the SWIM and the floppy connector. I know SE/30 schematics exist somewhere, so that should help you should any traces not have continuity
agreed, I've also seen a Macintosh Classic logic board that got that bad, but it was a parts machine for a Classic whose tube I necked, so I just relegated it to ewaste after neutralizing the battery acid
Old Macs like this can't use more than 2GB per disk. There are ways around it, like partitioning, but that gets fiddly quick. Plus, from the looks of it, the hard drive was already replaced with something 2GB or more
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