Apple keyboard won't write the @-symbol (Swedish keyboard)

First up, what DO you get when you type shift-2? Some other symbol?

It isn't clear whether you think the problem lies with the keyboard, or with the host system.

You say the problem occurs when you use this keyboard on another Mac... which implies a problem with the keyboard itself, but that's hard because the keyboard has no concept of which character to type - it simply sends the key code to the host system, and it determines what character to input. That's why the language/keyboard setting in System Settings is key, but it sounds like you don't get the @ sign regardless of the language settings?

There are a couple of things to try.

Start off by System Settings -> Keyboard -> Input Sources -> Show Input menu in menu bar:

Then look at the menu bar for the keyboard icon and choose Show Keyboard Viewer:

This will popup a window showing your keyboard, and as you press/hold different keys, it will show what the OS thinks each key maps to. Do you see the @ sign there?

If you do see it there, then there's some additional software on your Mac that's overriding the key input. Check System Settings -> Keyboard -> Text Replacements and make sure you're not overriding the @ sign with something else.

vagabund55 wrote:

Considering seriously if my wired Apple keyboard is defective?

Sure sounds like it. If other keyboards work, and this keyboard has the same problem when used with another Mac, then all the evidence points to a broken keyboard.

I'm curious as to whether the Keyboard Viewer shows other keys as changing when you hold shift or option?

I'm leaning towards a defective keyboard, but trying to wrap my head around why only the 2/@ key would be affected. Holding the shift or option key should show replacement characters for the whole keyboard, but if it's somehow skipping the 2 that indicates some kind of prescience which keyboards aren't known for :)

What do you get typing option 2 when the input menu at top right of the screen says Swedish?