The PC does not work and says cmos checksum error. Cmos checksum error defaults loaded what does this mean

Means that the current amount of data in CMOS memory does not correspond to the control one, i.e. the BIOS CMOS memory settings are violated (even though system time reset to “default” - the point in time when the BIOS chip was installed on the motherboard). As a rule, the culprit is the CMOS memory power supply - CR2032 battery. In the majority motherboards, message CMOS checksum error is accompanied and understood as a BIOS error. When you boot your computer, the following messages appear.

CMOS checksum error – Defaults loaded. Press: to continue or “CMOS checksum Failure

Error correction methods:

To boot the computer with default CMOS memory settings (Defaults), press F1.

If you understand the settings BIOS utilities Setup, press the key to enter the utility. Check BIOS settings, click, confirm the changes made.

If the same message appears again after unplugging the computer, it is time to change the CR2032 battery. Buy a battery and install it to replace the “dead” one (with the computer turned off!).

To make sure that the battery is working properly, you need to measure its voltage with a voltmeter. It should be more than 3 V.

Notes

1. Before servicing your computer, you must remove any electrostatic charge. To remove the charge of static electricity, equalize the potentials of the charges in your body and the “insides” of the computer by holding the chassis of the system unit disconnected from the network with both hands. Attention! Even after removing the static electricity charge, try, if possible, not to touch the terminals of the central microprocessor, video adapter processor and other microcircuits!

2. CMOS memory battery allows BIOS chip store utility settings BIOS Setup, including system time.

3. Average term CMOS memory battery life is 3÷5 years.

4. The reason for the appearance of the “CMOS checksum error” message may be not only a “dead” CR 2032 battery, but also virus attack, and software (or hardware) failure, as well as incorrect user actions.

5. The message “CMOS battery has failed” immediately indicates the need to replace the CR 2032 battery.

Sometimes, when you turn on the computer, the message “CMOS checksum error defaults loaded” may appear on the PC screen, after which the system pauses its operation. Pressing the F1 key temporarily solves the problem (the OS continues to load), but the next time you restart the PC, the problem occurs again. In this article I will tell you why CMOS checksum error defaults loaded occurs during boot, what are the reasons for this phenomenon and how to fix it.

CMOS checksum error - Defaults loaded

CMOS checksum error defaults loaded what does this mean?

Translated from in English the text of this message sounds like "Error checksum CMOS, default settings loaded".

For those who are not familiar with the term “CMOS”, let me explain that this term is an abbreviation for the words “Complementary Metal-Oxide-Semiconductor”, or, in Russian, “Complementary Metal Oxide Semiconductor”. In our case, CMOS is a small chip that stores a number of BIOS settings, which are responsible, in particular, for loading and operating our operating system.

To ensure uninterrupted operation of the specified chip, next to it on the motherboard there is usually a battery (usually a CR2032 element) that powers the CMOS DC low voltage. Duration of work of this element usually 5-7 years, which is quite enough for the average lifecycle of a standard PC.

Features of the CMOS error checksum error defaults loaded

Let us now take a closer look at what the “checksum” mentioned in the error message is. Essentially this is special indicator, designed to protect those located in CMOS settings BIOS from loss. Every time the computer turns on and starts to boot, the indicator stored in CMOS memory is compared with benchmark systems. If these indicators match, then the operating system boots normally. If the indicators differ, this automatically leads to the appearance of the message “CMOS Checksum error”.

Each computer reacts differently when a “CMOS Checksum Error” appears. Some computers warn the user of the problem and then continue booting using the existing data in CMOS. Other PCs also notify the user about the problem, but for further loading they use the factory settings in the BIOS, which are then reset to the CMOS memory. In this case, the text of the error message I mentioned appears on the PC screen.

Reasons for the error

As for the specific reasons for the error, they can be as follows:

The battery powering the CMOS chip has exhausted its resource (or is not working correctly);
Similar error;
The user or a virus program updated the BIOS;
The computer was not turned off correctly (as quite often happens, the user simply unplugged the PC cord from the outlet instead of standard procedure turning off the computer).

How to fix CMOS checksum error defaults loaded

Conclusion

If you encounter the message CMOS checksum error defaults loaded when booting your computer, this may indicate either a random malfunction of your PC or a failure of the CR2032 battery that powers the CMOS chip. Reboot your system, and if the error persists, then I recommend replacing the CR2032 battery, after which stable operation of the PC is usually restored.

In contact with

Once the user turns on his computer, he may encounter the message “Cmos checksum error defaults loaded,” and the system stops loading further. By pressing the F1 or F2 keys, the system boot can continue, but when you restart the computer this error arises again. In this article I will talk about the Cmos checksum error defaults loaded error, what are the causes of this dysfunction and how to fix it.

Features of the Cmos checksum error defaults loaded error

If you are interested in what Cmos checksum error defaults loaded is, then translated from English this message sounds like "CMOS checksum error, defaults loaded".

To make it clear what I’m talking about, I’ll explain to the reader what it is CMOS. As you know, it’s hard to imagine today’s computers without BIOS - a set of programs built into the hardware of your computer. The latter allow you to configure the hardware components of your PC, they are responsible for loading the operating system, and so on.

BIOS settings that the user can change in BIOS Setup are stored in a separate chip dynamic memory called CMOS (Complementary Metal-Oxide-Semiconductor or in Russian “Complementary Metal Oxide Semiconductor”). The memory capacity of such a chip is usually only 256 bytes, and in addition to the settings of your BIOS, it stores a number of parameters of your PC.

In order for the CMOS chip to remember the specified data, it needs constant power (albeit in a minimal amount). The latter is achieved through a miniature battery (usually CR2032), which powers the CMOS board for several years (on average 5-6 years). The battery itself is usually located next to the CMOS chip on the motherboard.

When the computer is turned on, the current sum of data in CMOS is compared with the control indicator, and if these sums do not match, then the user receives the error Cmos checksum error defaults loaded.

Also, in rare cases, the cause of the described dysfunction may be the influence virus programs. What does this mean Cmos checksum error defaults loaded we figured it out, now let’s think about how to fix it.

How to fix Cmos checksum error defaults loaded

If you are interested in eliminating the Cmos checksum error defaults loaded error, then to simply boot your computer’s operating system you will only need to press the F1 or F2 (or Delete) key.

If the problem repeats regularly after each reboot of your PC, then a physical replacement of the CR2032 element located on the motherboard of your computer is necessary. Turn off your computer, open system unit After removing the roof, find and remove the CR2032 by pressing the latch tongue (try to keep touching other parts of the motherboard to a minimum). Purchase a similar one at your nearest computer store (or market). new element, and install it to replace the removed one (in this case, the battery plus should usually be located on top).

After replacement, turn on the computer, install in BIOS current date and time, as well as other parameters necessary for comfortable work your PC.

It would also be a good idea to check your computer for the presence of various malware (Dr.Web CureIt!, Trojan Remover, Malwarebytes Anti-Malware and a number of other antivirus programs).

Video

When considering the issue of the value of Cmos checksum error defaults loaded, it is worth, first of all, to conclude that the appearance of the message “Cmos checksum error” often means the CR2032 element supplying the CMOS chip is discharged. To solve the problem described, it will be enough to replace the specified element (its price is an insignificant amount), and continue to enjoy stable work your PC.

In contact with

Today I came across a computer with one minor but unpleasant problem. Since it is quite common (every computer owner over 5-7 years old encounters it sooner or later), I decided to tell you in my blog why it occurs and how to solve it.

The “symptoms” are: the date and time on your computer is intermittent reset. This happens after electricity stops flowing to it (for example, you turn off network filter at night.)

Causes, diagnosis, and solution to the problem - read below. For this simple repair you will have to spend 50 rubles and 10 minutes of your time.

CMOS Checksum Bad/Error - Defaults loaded. What does it mean?

Not only that date and time constant gets lost. When you turn on the computer (after turning off the power), it usually produces the following “picture”:

Users who know English and have a little knowledge of PCs understand that they need to press F1 and set correct settings time in biose (or the time can be adjusted each time in Windows.), and for many such an inscription on the computer screen is confusing.

There are different types of text:

CMOS Checksum Bad/Error - Defaults loaded. CMOS RESET.

CMOS Date/Time Not Set

Press F1 to Run Setup/Continue

Press f2 to load default values and continue

Ignore wrong time It doesn't work on a computer. The fact is that when you try to access many sites, browsers give clock error.

Thus, the problem of constantly resetting the date and time can greatly ruin your life. But don't be upset! Next, I will tell you who is to blame for it and what to do.

The date and time on the computer constantly gets lost. Why does this happen and how to fix it.

Many people don't know, but the computer has a battery. It is needed there - to power the bios chip. This chip stores all the hardware settings of your motherboard. It is also needed to power the quartz, which is responsible for the clock in the computer.

Like any other, this battery can run out. When this happens, if there is a power outage, there will be no one to power your BIOS, and it will “reset”. It will come with the BIOS time and date get confused.

The solution is logical and simple - the battery needs to be replaced. To do this, you need to remove the cover of your PC and find the round battery on the motherboard. Don't tell me you looked and you don't have it there. Believe me - there is. Most often, it is visible immediately. But it can easily be hidden under the video card, as was the case in my case Video on YouTube channel.

When you find it, you can measure the voltage of the battery with a tester and make sure that it is dead. Or you can change it right away.

A whole battery must produce at least 3 Volts!!!

How to change the battery in a computer?

This battery is marked CR2032. You can buy it at any computer store, or on Ali. I bought it from Ikea:

There is nothing difficult about replacing the battery.

You just need to carefully pry it up with something like a flat-head screwdriver. It is spring-loaded and will fly out on its own.

In order to put new battery back, I think you won’t have any special questions either 😉

[VIDEO] - Why does the time and date on the computer get lost?

After replacing the battery, I’m sure the problem with constantly resetting the clock and BIOS will not bother you for the next five years!

Your computer will become outdated faster and you will buy a new one :)

Don't hesitate to like it if it was interesting!

When you boot your computer, the following messages appear:

“CMOS checksum error – Defaults loaded. Press: to continue,

: BIOS Setup" or "CMOS checksum Failure".

This means that the current sum of data in the CMOS memory does not agree with the control one, i.e. the BIOS CMOS memory settings are violated (even the system time has been reset to the “default” one - the point in time when the BIOS chip was installed on the motherboard ). As a rule, the culprit is the CMOS memory power supply - CR2032 battery. On most motherboards, the messageCMOS checksum error accompanied by sound signal and is understood as BIOS-error .

What to do?

To boot the computer with default CMOS memory settings (Defaults), press F1.

If you understand the settings of the BIOS Setup utility, press the key to enter the utility. Check the BIOS settings, click, confirm the changes made.

If the same message appears again after unplugging the computer, it is time to change CR2032 battery. Buy a battery and install it to replace the “dead” one ( on offcomputer! ).

To make sure that the battery is working properly, you need to measure its voltage with a voltmeter. It should be more than 3V.

Notes

Attention! Even after removing the static electricity charge, try, if possible, not to touch the terminals of the central microprocessor, video adapter processor and other microcircuits!

2. The CMOS memory battery allows the BIOS chip to store the BIOS Setup utility settings, including the system time.

3. The average service life of a CMOS memory battery is 3÷5 years.

4. The reason for the message “ CMOS checksum error"maybe not only "shrunken" CR 2032 battery , but also a virus attack, a software (or hardware) failure, as well as incorrect user actions.

5. Message " CMOS battery has failed» immediately indicates the need for replacement CR 2032 batteries.