flup flup flup

I found this link on your site (https://tinkerdifferent.com/threads/mac-plus-with-a-flup-flup-flup-noise-on-boot.1254/), where there was the same "flup, flup, flup" problem as the one I'm having. The first thing the link suggested doing was checking the continuity of the blue wire within the...

I ran into a Macintosh Plus which when booted makes a continuous flup flup flup sound. This can occur if there's a voltage rail short on the logic board, floppy, or SCSI drive. The short can cause the hidden fuse inside the power harness that goes from the analog board to the logic board to...