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What kind of medium are you using to upgrade each time? All I had to upgrade from 7.5.5 to 8.0 was the built in Floppy drive and it was quite the headache 😅.

Sure enough, for anyone that comes across this in the future, it was a loose cable. After seating it all and putting everything back together, its looking great! Thank you everyone for your input!

Turns out I have a Hosiden panel, which from your site I saw isn't common. Other than cable that runs to the [inverter board?] that was slightly loose, everything was snug. Reseated every FCB I could see, gonna put everything back together tomorrow and give it a test. Didn't break anything, so...

Shoot! Okay, iiiDIY posted a video on YouTube containing the cap replacement, and I've seen videos from polymatt containing portions where he replaces CCFL tubes, so at least I have somewhat of a guide 😅. I'll start with a simple cable reseat on both ends and see if that works! Edit: Thanks for...

I purchased my Powerbook 540c secondhand about 4 years ago, powered it on once, then put it in storage. In search of a new hobby, I pulled the 540c back out and decided to start tinkering around with it [getting AppleTalk to function, updating System 7.5, etc] and had it powered on for roughly...