Well if you have caps on you cant use the CTR+a shortcut, but otherwise you can just hit the visible shortcut in the upper right corner.(If you cant see it try hitting CTR+ spacebar 2 times to go to "default" interface.)
SimplyMaya specialises in Maya tutorials. We offer over 1,000 individual Maya training videos, ranging from basic Maya tutorials through to intermediate Maya tutorials. Our tutorials are created by instructors with industry experience and are designed to get you up and running in Maya quickly without making it seem like hard work.