Today I tried out an old M2 for the first time with an USB/P2 adapter. For the first 10 minutes it worked fine. Then I set it aside on my desk, left the room for a second, came back and suddenly the caps lock and scroll lock lamps were on and not a single key reacts anymore. Nothing has fallen onto the keyboard and the keys are not stuck. I already replugged the board and restarted the computer, and the two lamps went back on immediately.

I run Fedora Linux on a mid-2011 Mac mini and would be thankful for any advice.

  • Welcome to Retrocomputing Stack Exchange. Thanks for the question; this is quite a surprising problem. You might want to read the tour and have a look at some other questions to get familiar with the site; you might be able to answer some of them.
    – wizzwizz4
    Jan 29 '17 at 16:17
  • The adapters vary in quality. The first one I got reset regularily losing keystrokes, the next one worked at lot better. Jun 30 '21 at 14:26

It's probable that the capacitors on the controller PCB have failed -- this seems to be a common fault with M2 keyboards.

There are various pages that walk through how to replace them, for example this one. There are two capacitors to replace: one is 2.2uF 50v and the other is 47uF 16v.

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