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v Scratching the surface of the reader with a hard, pointed object.
v Scraping the surface of the reader with your nail or anything hard.
v Using or touching the reader with a dirty finger.
If
you notice any of the following conditions, gently clean the surface of the
reader with a dry, soft, lint-free cloth:
v The surface of the reader is dirty or stained.
v The surface of the reader is wet.
v The reader often fails to enroll or authenticate your fingerprint.
Caring for your computer
Chapter 2. Caring for your computer 7