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Q: What happens if you lose the CMOS information on a PC system?
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If the CMOS battery dies you can lose the settings in..?

If the CMOS battery dies you lose the settings that are held in the BIOS (Basic Input Output System). These include settings such as date/time, boot order,etc.


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What happens when the CMOS battery starts to die out?

You will lose all custom settings in the BIOS, and the BIOS will revert to the basic default every time the computer is restarted.


What keeps the CMOS data current and up to date?

The data is CMOS is on a chip called RAM. RAM will lose data when it loses power. A small battery on the motherboard is used to keep continuous power to CMOS when the PC loses power.


What Memory does not lose it contents when power is removed from the computer?

Read Only Memory (ROM) is not erased when you turn off your computer. There is a chip called the CMOS chip on your motherboard that holds all of the hardware information about your computer and other things as well such as the date and time. That information has to be accurate are your computer will not start properly. The motherboard has a small round battery called the CMOS battery it keeps about 5V of electricity always flowing even when you shut it off so that the data in the CMOS can be retained.ROM


What should you do if you lose the settings saved in cmos ram?

Nothing, the computer will run fine on the default settings usually.


What should you do if you lose the settings saved in CMOS RAM because of the battery going bad or being disconnected?

Data saved in cmos ram cant recovered if ram crashes suddenly but in case bettery or power failler 1) dont eject the ram runddnly wait for halting .2) use alternative system for power .3)detach the ram and place it in another ram reading system and fatch the data.


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How is CMOS RAM able to hold data even when the power is off?

CMOS is not RAM. While it is memory, unlike main system RAM, CMOS is very tiny and only holds the BIOS configuration, nothing else. RAM is made from transistors and capacitors, which must be recharged. CMOS is made from several transistors wired as flip flops. It only needs a tiny amount of power to hold its data, and that comes from a small battery. If you remove the battery, it will lose everything.


What could make a laptop not sense its hard-drive without visible damage or setting changes?

The CMOS battery could be kaput. Therefore making the computer lose all BIOS settings whenever its powered off. Another symptom of this would be the system time & date being reset every time as well. It could also be a loose connection. You might try opening up the compartment and pulling the HD out & reseating it. Do this with the system powered off & the battery removed. It could also be a dead hard disk. It happens. And given the hard life that laptops generally live, it happens a lot.


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