The two dashed lines let you know that the computer is in standby.  To wake from standby mode, change the computer screen to show Average Speed, press both the MODE and SET buttons (the two side buttons) and spin your wheel.  The computer will flash zeroes and then show a steady zero in place of the two dashed lines. The same should be performed for cadence.

If your computer screen is blank, only shows the clock, then the computer is in sleep mode:  To wake up the computer from sleep mode press any button on the computer head, spin your wheel and rotate your crank.  This will connect your speed and cadence sensors to the computer.

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