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CMOS Battery hell will cmos battery replacing remove previous setiings

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Yes ..the batery removal will erase your bios settings and will set them to default settings..pay attention to disconect the computer from the energy supply and take out the back energy cable from the computer when doing this.
second..after you changed it,with the computer always off make  abios reset by switching the jumper on the mainboard according to the instructions provided in the user manual...after that connect and get on the computer and remake the changes and bios..
good luck
bye

Posted on Feb 03, 2008

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http://support.dell.com/support/edocs/systems/latc600/sm_html/index.htm

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http://www.zlectronic.com/product/RTC-CMOS-Battery-3U490-For-Dell-Latitude-C600-C500-D400.html

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All mother board has a CMOS, complementary metal oxide semiconductor, battery. The main purpose for the CMOS battery is to store the system time, date and bios settings even if the computer is turned off or the main battery dies.

Turn off the computer (laptop) unplug it. Remove the Phillips screws that secure the motherboard cover then release the cover from the clips on the bottom of the plastic casing. Lay the cover aside then locate the CMOS battery cable on the right side of the motherboard. Unplug the cable then remove the battery. After a few minutes plug the CMOS battery into the motherboard... Replace the screws then turn the computer (laptop) back over. The CMOS battery is unplugged for more than a few minutes your BIOS will be reset to the default manufacturer settings.

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The CMOS, which stands for complementary metal-oxide semiconductor, is the hardware component of a computer that supports the BIOS, or basic input output system. The two terms are often used interchangeably, and the two technologies work together to perform the same basic function. They maintain the low-level settings on a computer, letting the computer know, even before the computer's operating system starts, what kinds of hardware the computer has available, such as hard drives and video display adapters. A special battery located on the computer's motherboard powers the CMOS. To reset the CMOS on a Dell computer, briefly remove and then replace the battery
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  2. Step 2 Remove the computer cover. All Dell systems have a cover panel on the chassis that you can remove so that you can access the system's motherboard and internal components. For some Dell computer lines, such as OptiPlex, the computer cover is held in place by a release latch located on the back of the computer. Pull the latch to release the cover and then slide the over up and away. Other lines, such as Dimension, have large, slotted thumbscrews. Turn the screws counter-clockwise until they disengage from the chassis, the slide the cover off the computer. Dell computers often ship with the computer's user guide in CD form or with the guide pre-loaded on the system's hard drive. You can locate the instructions for removing the cover from your particular system in the user guide.
  3. Step 3 Locate the CMOS battery on the system's motherboard. CMOS batteries range in size from size and thickness from about the size of a nickel to about the size of a quarter. The CMOS battery will generally be labeled CMOS on the motherboard and will be the only battery openly exposed on the motherboard.
  4. Step 4 Remove the CMOS battery by prying it gently up out of its socket. The sockets are specifically designed to allow the battery to be replaced.
  5. Step 5 Wait 30 seconds, and then replace the battery in its socket. This will reset the CMOS. Replace the computer cover to complete the process.
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