That's the one.

There seems to be a common thread here, ie people plugging the display board in
incorrectly. I would suggest that anyone else doing the button mod check very
carefully that they have the ribbon cable header connected properly before
powering up for the first time. It sounds obvious, but it's easy to do unless you
check visually if you're not used to it.

Luckily it seldom causes anything other that a blown fuse, but a) they're a pain
to replace if you don't have the experience, and b) it can be more serious if
you're unlucky, up to and including zapping the SA1100.

pca

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Experience is what you get just after it would have helped...