There are several reasons why a cyclocomputer (sometimes called a velocomputer, a speedometer or bike computer) may not work. The first and most obvious thing is that the battery is running low or actually drained. This is normally the case if the screen is blank or the numbers are very faint. If this seems to be the case, take the bike computer off of its mount, turn it over and remove the battery cover with a coin. These are the so-called "button" batteries that you've probably seen before in many small electronic gadgets. Extract the old battery and buy a replacement. These batteries are readily available in watch shops, convenience stores or online. If the device is revived after replacing the battery, simply follow the manufacturer's instructions to reprogram the device as needed.
If you are having problems where the display numbers are strong and vivid but the unit is constantly resetting itself, that is a typically signs of a problem with the battery's connections. Open the case as described above and use a clean cloth to wipe off the contact points inside the unit where the battery connects. If the bike computer got wet (as in really soaked, more than just an ordinary rain shower will do), that can cause similar problems. In that case, leave the battery lid off so the unit can dry out for a day or two. After you've done this, reinsert the battery in its case and see what happens. You should find that the numbers on the display still showing vividly and now the problem with the unit resetting itself to be solved.
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