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In almost all modern PC's there is a battery located inside the computer. The battery is the common CR2032 battery. It can be found in most stores that have a decent battery selection.
First, unplug the power cable from your computer. To access the battery, you must first remove the case cover. If you are unsure how to do this, consult the manual for your specific computer. Most commonly, the side of the tower case opposite to the side with the keyboard/usb connectors can be removed with two or three case screws.
Once you have opened the case, locate the motherboard. It is the largest circuit board. The USB and Keyboard connectors are on this board. Look around an locate the CR2032. There will be a clip holding it in. Press the clip aside with a small pen or screwdriver. The battery will pop up and you can remove it. Replace it within a few seconds, and you won't have to reset the time and date on your computer.
Replace the case cover, then plug in the power cord. Go ahead and power on your computer. If an error is shown that says that the date and time are not set, follow the instructions given to enter the BIOS setup. Use the arrows to get to the date and time, and then use the -/+ keys to change them. Look for the information about saving and exiting, and do so. Your computer will now reboot. You're done!
The whole procedure takes generally less than 5 minutes unless the computer is impossible to get to.
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∙ 13y ago
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When you turn off a computer at night it loses the date and you must reenter it each morning what is the problem and how do you solve it?
<improved answer>Just to correct the old answer, if the CMOS battery is dead, then the computer will not turn on in order for you to reenter it the next morning. It means that the CMOS battery is getting weak, and yeah, you could replace it. <old answer>It is most likely that the CMOS battery is dead. Replace it.
What is the most common CMOS battery modal number?
Most motherboards use a 2032 battery.
Why does a computer turn on if the CMOS battery is removed?
Removing the CMOS battery will not prevent the computer from turning on, it will only cause the information in the CMOS RAM to be lost (while the computer is turned off). When you turn on the computer after the CMOS battery has been removed, while it will turn on it will most likely not boot the OS correctly but will stop in the BIOS and require you to completely setup the CMOS parameters again before you can tell it to continue..
What is the average lifespan of a CMOS battery?
Most batteries are expected to last 3 to 5 years.
How does the bios relate to the cmos?
BIOS (basic input output system) is the menu system programmed into the firmware of your motherboard which allows you to change its settings and input some basic hardware information. CMOS (copper metal oxide semiconductor) is a type of battery. It is the type of battery most commonly used on motherboards to power the circuit which remembers the BIOS settings and system time. Without a CMOS battery, this data will be lost every time the system is powered off. In common nomenclature, these two phrases are often used interchangeably. Some people will refer to the BIOS menu as the CMOS menu, and will refer to the CMOS battery as the BIOS battery.
You boot a notebook and discover that CMOS setup has lost configuration information or that the date and time are wrong What could be the most likely reason for this?
Most likely the small battery inside the case that powers CMOS RAM needs replacing.
How can we replace CMOS battery in a PC?
Most PC motherboards use a coin cell battery as a CMOS battery backup for BIOS settings. Most common battery used for this application is CR3032 and can be easily replaced. You can turn off the computer, remove power cables, open the machine and locate this coin cell on the motherboard and remove old battery from the socket with a plastic tool or your finger nails and then insert a new one in the socket. If using a metal tool/screw driver be careful that you do not short upper and lower side of the coin cell (which can cause a short circuit, can create a spark and will damage the battery).
What is the most likely cause of the problemthat the computer clock keeps losing the correct time?
This is usually caused by a dying battery. In most modern systems, the BIOS can retain most settings even after the battery goes dead. The sole function of the battery in these cases is to keep the system's real-time clock running. The real-time clock is a fairly cheap component. A drift of a couple of seconds a day is typical in low-end systems. If the exact time is important, I would suggest synchronizing your operating system's clock with a time server every hour or so.
Where to buy a cmos battery?
Most computers use a standard 2032 type battery. These can be purchased at any drugstore, department store or electronics store. It is always a good idea to take the old battery with you to ensure you buy the correct battery.
What is c mos ram?
Cmos ram refers the random access memory used by the cmos which is the primary bios setup on the computer. Most computers use a regular loaded ram to load the basic input output system. The cmos ram can also sometimes refer to the cache that the motherboard has. In general when you mention cmos three things should come into mind. The CMOS battery, the CMOS ram ( stores settings) and the BIOS (basic input output system) Hope this Helps!
Does CMOS play a major role in modern technology?
Yes, complementary metal oxide semiconductor (CMOS) devices are essential to most modern digital electronic equipment. By making use of both N-channel and P-channel MOSFETs in the same circuit power consumption can be minimized (i.e. only leakage current when idle as one type of MOSFET is always off when the other is on except for very brief periods when changing state) and reasonably fast switching speeds are possible. Most microprocessors and other complicated digital integrated circuits are implemented with CMOS circuitry (except for certain portions where switching speeds faster than can be achieved with CMOS without the power consumption of the CMOS circuits rising too much: e.g. ALUs). CMOS is also used in memory devices that must retain data even when the system is turned off, by using a small inexpensive battery that can power the idle CMOS memory for years without needing to be changed.
Do you need a cmos battery for your computer to boot?
Most new computers can automatically determine the correct settings needed for your hardware, and some even store configuration data in a non-volatile Flash chip. These computers effectively do not need a CMOS battery for anything except maintaining the correct time. Older computers, where you had to specify the parameters for the hard drive in the BIOS, need a CMOS battery. Otherwise, you would have to enter them in every time you booted the computer.
