HP ProBook 640 G1 Maintenance And Service Manual page 136

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To specify a boot device from the Express Boot menu, select your preference within the allotted time,
and then press enter.
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To prevent the computer from defaulting to the current MultiBoot setting, press any key before the
allotted time expires. The computer will not start until you select a boot device and press enter.
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To allow the computer to start according to the current MultiBoot settings, wait for the allotted time to
expire.
126 Chapter 9 Computer Setup