An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert who has answered 1,000 questions.
Re: replacing CMOS battery
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
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
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.
<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>2. Turn off the computer. Wait 3 to 5 minutes and start the
<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>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>2. Let the computer on for 24 hours. Restart the computer
and find the error.<br />
<p>3. Change the CMOS as the return error.<br />
CMOS Checksum Bad or CMOS Date/Time Not Set<br />
<img src="matrix12_1.jpg" />
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 />
<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 />
<img src="matrix12_0.jpg" />
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 />
Hope this will help...Your response is very much appreciated...
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.
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.
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.
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