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Replacing CMOS battery

I replaced my CMOS battery, what must i do next?

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See if computer will reboot as normal. If not shutdown and go into the bios and find the default/setup settings and turn on. then reboot.If you have a problem still. Contact me here with motherboard type and what os you are running. I hope this has been helpful RICHARDM69

Posted on Dec 06, 2008

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How to clear cmos zs600g


You can clear cmos the same on any machine please unplug the machine take the back off you will see a silver battery about the size of a quarter there should be a little place next to it that if you press very lightly it will pop the battery out leave the battery out for 10 minutes this will clear the cmos, now put the battery back in with light pressure, once in replace the back of the machine and then you can boot the machine.

Jul 08, 2014 | Acer 23" Intel i3-3220 3.3GHz All-in-One...

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How to verify that the CMOS battery needs to replace


<p>The CMOS battery is named after the Complementary Metal Oxide Semiconductor power. The CMOS has the current date and time functions for desktop and laptop computers. It allows the computer to automatically adjust the time, even on computers that are disconnected for long time. When a computer no longer has the date and time and forget it on every boot, the CMOS battery probably needs replacing. Some computers have messages when the battery is weak, while others just lose the current date and time after each shutdown.<br /> <p>Time & Date Errors<span> </span><br /> <p><span> </span><br /> <p>1. Turn on the computer. Look in the task bar at the bottom right. Make sure the date and time is set correctly. Double-click the time and click the up or down arrow to switch to the correct time. Click on the arrow next to month to change the month. Click "OK" when finished.<br /> <p><br /> <p>2. Turn off the computer. Wait 3 to 5 minutes and start the machine.<br /> <p><br /> <p>3. Look on the taskbar to see if time was lost and said a strange date January 1, 2000. Replace the CMOS battery, if this is the case.<br /> <p><br /> <p>CMOS Error Message<br /> <p>1. Look for error messages like "CMOS checksum error", "CMOS Read Error" or "CMOS battery failure" when you start your computer. These errors are caused in the machines shut down for several months or when the CMOS must be replaced.<br /> <p><br /> <p>2. Let the computer on for 24 hours. Restart the computer and find the error.<br /> <p><br /> <p>3. Change the CMOS as the return error.<br />

on Jun 21, 2011 | PC Desktops

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CMOS Checksum error


<b>Issue:</b><br /> CMOS Checksum Bad or CMOS Date/Time Not Set<br /> <br /> <img src="matrix12_1.jpg" /> <br /> <br /> <b>Cause:</b><br /> This issue is caused when the CMOS values are incorrect. This issue can occur because of any of the below possibilities.<br /> * Bad or old CMOS battery. <br /> * BIOS update<br /> <br /> <b>Workaround 1:</b><br /> 1. Disconnecting power from computer without shutting down computer.<br /> 2. Attempt to reboot the computer. If error still occurs after rebooting the computer enter CMOS setup and check all values, this includes verifying the time and date are correct. Once everything has been verified and/or changed make sure you save and exit CMOS setup. <br /> 3. If you have a Phoenix BIOS and have an option for 'Reset Configuration Data', set this value to 'Yes' and save and exit the CMOS. <br /> <p>4. If the computer was had the power disconnected while it was still running it is possible this could cause the CMOS to become corrupt. Ensure that the computer is ready to be shut off before turning off the computer. If you have a laptop computer ensure that the battery is charged before disconnecting the power connection. <br /> 5. If the CMOS values have become corrupted entering the values in CMOS setup and saving and exiting CMOS should resolve your issues.<br /> <p><b>Note:</b> If this issue continues to occur after you turn off your computer off it is possible that the CMOS battery may be failing or already bad. Before considering replacing the CMOS battery try leaving your computer on for several days. <br /> <b>Workaround 2:</b><br /> <p>If you performed workaround 1 and the error occurs again after a complete power down (i..e. removing the power cord), the CMOS battery is likely bad. Most systems use a small coin style lithium battery. These often last 3-6 years, but at some point run out of juice and need to be replaced. For desktops, your system manual or motherboard manual should specify the type of battery and location on the motherboard. For laptops, it is often very difficult to access and may require a professional to replace it. To replace the battery on a desktop system:<br /> 1. Turn off the system and remove the power plug.<br /> 2. Remove the case or side panel to access the motherboard. <br /> 3. Look for a round silver coin cell, typically in a black holder.<br /> <br /> <br /> <img src="matrix12_0.jpg" /> <br /> 4. Remove the battery while noting which way the battery is located. You may need a small flat screwdriver to release the side clip. <br /> 5. Install the replacement battery with the same battery type, being careful to insert it in the same direction as the removed battery (or using the polarity marked on the holder or manual). <br /> 6. Reassemble the case and power. <br /> 7. Turn on the power. You will get the CMOS Checksum Bad error once more, but it should be the last time. Go into the BIOS setup and set the date and time, and any other options you prefer.<br /> <br /> <br /> Hope this will help...Your response is very much appreciated...

on Jan 24, 2011 | PC Desktops

2 Answers

Cmos bios battery is dead? press F1 to continue screen appeared for about 4 months and now pc fails to boot. how much to replace cmos batt and give desktop a once over service? thanks.


The cmos battery is a simple button cell battery and can be replaced very easily http://www.computerhope.com/issues/ch000239.htm
A once over will very heavily on the service you use but i'd imagine anything up to $30.

Feb 28, 2011 | Dell Dimension 9100 PC Desktop

2 Answers

I have windows 7. When I shut down and then restart later or the next day the clock shows the time of shut down and then run ok but I have to reset it or click on internet sync and that works. Then the...


If this is an older PC (3-5 years or more) then most likely the backup battery on the motherboard has become weak.
On many motherboards this is a coin cell, which can easily be replaced (on others it is soldered in, though), just have a look.

Mar 24, 2010 | PC Desktops

1 Answer

I have an Dell OptiPlex GX150 and the cmos clock battery only operates for about 30 days. I have replaced batteries twice with batteries from different sources. tks Steve


First you should check that you cmos connection is clean, not just from dust ect, but is it possible that the original battery leaked? This would of caused a short circuit and the damage is what is causing the batteries to leak.
Flashing the CMOS is the next route, this is done by going to the site of the Motherboard Manufacturer, it will also explain how to Flash/Upgrade the CMOS.
If this doesnt solve it it, you need to check that the pins/Jumpers that control the BIOS, again the site for your motherboard will have a print where you can check that the pins are correct(check that the are fitted tightly first!)
Next, try resetting the jumper for the BIOS, usually located closest to the battery. remove it with the power off, power on and off, then enter the BIOS and load default settings. It will Beep while starting up (if allowed) this will not cause a problem, the beeps are only telling you there is a problem, but you already know the jumper settings are wrong.
If these fail, then its most like a short circuit, if this is the case, pack it all in a box and return to Dell.

Feb 17, 2010 | Dell OptiPlex GX150 PC Desktop

4 Answers

Help me out i have a problem with my hp compaq dx2390. Every time i switch it off it resets only its date to yesteryear. Every startup i have to manually set the current date. I've tried by reinstalling...


Your bios battery is probably dead. It looks like a watch battery. You will have to open the side of the computer and look for it on the motherboard. You can take it out and replace it at any cvs or walgreens.

Jan 19, 2010 | HP Compaq dc5700 Microtower - Free Flat...

2 Answers

Forget CMOS password, how to reset CMOS password


convinent thing this password more like a pain in the you know what
Take the cover off to expiose the MP BO
on the MOBO search for the cmos reset jumper. There is small print to ID what they do
Just unplug and plug iback in as simple as that and everthing shouyld be just fine..
How to tak e the cover off is a different item

Aug 01, 2009 | Dell OptiPlex 210L PC Desktop

3 Answers

Bypassing password


short out the jumper pins labeled CMOS

Jul 09, 2008 | Fujitsu Siemens Celsius R610 PC Desktop

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