Yes CMOS is available in modern computer.
CMOS definition:
Complementary metal-oxide semiconductor, or CMOS, typically refers to a battery-powered memory chip in your computer that stores startup information. Your computer's basic input/output system (BIOS) uses this information when starting your computer.
CMOS-related error messages could be caused by a faulty or discharged battery. The battery can become discharged if your computer has been turned off for a very long time. To resolve CMOS-related errors, check the information that came with your computer or contact your computer manufacturer. Because your CMOS settings are specific to your computer's hardware, Microsoft can't provide specific instructions for changing them.
CMOS battery of your laptop maintains hard disk, time and date, and other drivers and configuration settings in a CMOS memory. You will see these tiny CMOS batteries connected directly to the laptop’s motherboard.
<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.
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it contains a small amount of memory, or RAM, enough to configuration or setup information about the computer. This chip is responsible for remembering the current date and time, which hard drives and floppy drives are present, how the serial and parallel are configured and so forth. When the computer is first turned on, it looks to this CMOS chip to find out what hardware it should expect to find.
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Modern PCs store the CMOS password in the CMOS memory itself.
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CMOS
No
There are three ways to clear the CMOS on a computer. You can access the BIOS menu and reset the BIOS settings, you can use the motherboard jumper or clear it by reseating the CMOS battery.
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..
Chances are that the CMOS Battery on the motherboard is dead and needs to be replaced. Without this battery, the computer can not remember the CMOS settings when the power is turned off.
small battery located on the motherboard or computer case.
The CMOS is run off of a battery on the motherboard.
Generally, no, you cannot enter the CMOS setup after you have booted. But it depends on the exact computer and if there is a separate CMOS configuration tool. In fact, the IBM AT was like that, and it required a separate setup program that ran after the computer booted. Some of the modern computers will let you change certain CMOS settings on the fly if you install a utility their utility for doing that.
The CMOS remembers the time and date settings of the computer, and also remembers the Hardware settings.
CMOS is the little battery in the computer's motherboard which keeps the computers internal clock running.