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in desktop computer this can be done by shorting cmos reset dip switch or removing cmos battery momentarily for a couple of seconds or minute at least. If you are working on a laptop computer the location of the dip switch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment.
there is no any dip switch for reseting COMS
if u want to reset coms u need to disconnect u r laptop battery & then disconnect coms battery from motherboared witch under keypad .then get press powre button for 30 sec.for discharge static charge of u r motherboard .after that u connect all this to u r laptop u get reseted COMS
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the cmos jumper which is usually located near the battery has
2 position one is short and the other is opened . its not possible for the system to start if its short at the same time no damage will occure if the system is started while its short.
so whenever the system starts then the jumper is set right.