Apple twentieth anniversary mac Service Manual

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The pointer (
8
) sticks or jumps when you use the trackpad.
m Make sure to use only one finger and that your finger is dry.
Typing on the keyboard produces nothing on the screen.
One of the following is probably the cause:
m You haven’t selected any text or set the insertion point (i).
Make sure the application you want to type in is the active application. Then place the pointer (8) in
the active window and click to set an insertion point (i) or drag to select text (if you want to replace
the text with your typing).
m If the computer beeps every time you press a key, Easy Access is probably turned on.
Use the Extensions Manager control panel in the Control Panels folder in the Apple (K) menu to
turn off Easy Access. For more information about Extensions Manager, see the information about
managing extensions in Mac OS Guide, available in the Guide (h) menu.
m The keyboard is not connected properly.
Turn off the computer by pressing the power button on the back of the computer. With the
computer off, check that the keyboard cable is connected properly at both ends. 
m Some system software features are turned on that affect the way the keyboard works.
Open Easy Access from the control panels listed under the Apple (K) menu and turn off Sticky
Keys, Slow Keys, and Mouse Keys.
Solutions 
to Common
Problems
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