OS X Keyboard Alt key language I use a MacBook with English keyboard and sometimes I need to write something in my mother language, which is Turkish. So I can write the characters with Alt key. But I changed the computer at office and now I can't write characters that I want. I want to write ı but it writes ˆ . 

Is there any way to set up the Alt key language?

The older computer had an English keyboard but now I have dutch keyboard on the computer. I set the keyboard with U.S..
Go to system preferences/keyboard/input sources and make sure that only Turkish Qwerty or Turkish Q - Legacy is on the list and everything else is gone.