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What happens if I disconnect my cmos battery - Pavilion HP Computers & Internet

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It resets the cmos to default status. Be careful though some operating systems require specific settings to boot up.

Posted on Feb 24, 2015

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Laptop not working. says disk read error occurred. tried ctrl+alt+delete but saus phoenix secure core (tm) set up itility and enter pass word. I dont know the psss word.


What you have seems top be one of two issues, plus the password problem. Either the hard drive has malfunctioned in the laptop and the OS cannot read the disk to boot up, or possibly the BIOS/CMOS has "forgotten" where the boot device is. This can happen if there is a low CMOS battery event. In either case the laptop will revert to the BIOS/CMOS to allow the user to check settings and determine if the hard drive is being detected by the system. Unfortunately, it appears that someone has placed a BIOS password on your machine. These are not easy to get around. The only sure way to remove it is to disconnect the power cord, remove the battery, access the interior of the laptop, and remove (or unplug) the CMOS battery. Once you have done that, press and release the POWER ON button several times. This will discharge all power in the CMOS circuit and the CMOS will reset to factory defaults (no password). Then plug in or reinsert the CMOS battery, close the case, replace the battery and plug in the device and restart the system. You should then be able to access the CMOS. If the CMOS detects the hard drive on the main page, check the boot device and boot sequence menus to be sure that the HDD is the first device for bootup. If the HDD is not detected, or if the HDD is detected and all settings are correct and you still cannot boot to the drive due to the read error, you may need to replace the hard drive. If you have the recovery disc or an original OS install disk, you may be able to boot to it and attempt a repair install, where the system will try to fix whatever happened to the OS. If there is simply a corrupt file, the repair install may fix the issue, If the error in a physical one in the system area of the hard drive, you may be out of luck.

Nov 02, 2016 | Computers & Internet

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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 | Computers & Internet

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CMOS Checksum error


Issue:
CMOS Checksum Bad or CMOS Date/Time Not Set


ae4e911.jpg
Cause:
This issue is caused when the CMOS values are incorrect. This issue can occur because of any of the below possibilities.
* Bad or old CMOS battery.
* BIOS update.

Workaround 1:
1. Disconnecting power from computer without shutting down computer.
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.
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.
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.
5. If the CMOS values have become corrupted entering the values in CMOS setup and saving and exiting CMOS should resolve your issues.
Note: 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.
Workaround 2:
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:
1. Turn off the system and remove the power plug.
2. Remove the case or side panel to access the motherboard.
3. Look for a round silver coin cell, typically in a black holder.


06928b6.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.
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).
6. Reassemble the case and power.
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.

on May 30, 2010 | Computers & Internet

2 Answers

I have a HP Pavilion Dv4-2049wm And the screen went black. When i turn it on the keys light up. But the Caps Lock And Number Key blink 2 times. From what i read its a bios error. What do i do to fix this...


I don't think a bios update will fix the problem. I think the LED fault code indicates a CPU error. The CPU rarely fails suddenly so it is unlikely to be a faulty CPU (although not impossible). It may be due to corrupt CMOS data. This is the settings in the bios, backed up by a small 3V battery inside the laptop. This data can be cleared and reset to default but you need to disconnect from the mains, remove the laptop battery and then locate the CMOS battery and disconnect it. Unfortunately I cannot tell you where this battery is in your laptop. You will need to remove the keyboard and have a look inside. It may be accessible from underneath after removing the main battery or under another cover. After you locate and disconnect the cmos battery, leave it for a few minutes and then re-connect the battery and put the laptop back together. Try switching it on again.

Mar 06, 2011 | HP Pavilion dv9623cl Notebook

1 Answer

Forgot my password. Can I do something with the cmos to reset & not lose all the software that has been installed? It's a Dell Inspiron 700.


Disconnect the battery, unplug it, then open it up. There should be a small round battery called the CMOS battery somewhere in there. Pull that out. Then plug your computer in and boot it up without the CMOS battery. It should say password disabled. Turn it off, disconnect it, put it back together, and you're good to go. This only works if its the bios password that you forgot.

Jul 12, 2010 | Dell Inspiron 700M Notebook

2 Answers

My brother has turned on his computer after several months to be asked for a password in the 'phoenix awardBIOS CMOS setup utility' screen - he can advance no further because he does not know the password...


Did he have a password before, and just forgot it, or did this just happen on it's own?

There is a small battery inside the laptop which provides the tiny amount of power required to store all of the BIOS/CMOS settings (including the password), even if your laptop is completely disconnected from power.

There's really no way to recover these passwords, so you have to reset the CMOS/BIOS:

1. Disconnect the laptop from all power and batteries.
2. Find and remove the CMOS battery (usually a small button battery) inside the laptop.
3. Leave it alone for a day.
4. Replace the CMOS battery with a new one.

This should reset the BIOS/CMOS back to the factory defaults, with no password. He made need to do a bit of configuring to reset the date, time, etc.

Apr 25, 2010 | Microsoft Windows XP Home Edition

1 Answer

Manual reset motherboard: Soyo SY-K7VME


Bios settings are retained by the Motherboard Battery in the CMOS. Disconnecting the battery clears CMOS and returns the settings to their original state. Typically this can be done by simply removing the CMOS battery and waiting about 15 seconds before reinserting and booting PC. Nowadays most Motherboard manufacturers supply a jumper to not only disconnect the battery but also ground the CMOS to effectively drain any residual power.

The instructions for your MB are found below. JP5 is located to the left of the battery and next to the PCI 2 slot on your MB. There is a Manual for your MB on this site and the MB layout can be found at

http://www.fixya.com/support/p281070-soyo_sy_k7vme_motherboard/manual-35533/page-5

Follow the steps below to clear the CMOS memory.

1. Clear the CMOS memory by momentarily shorting pin 2-3 on jumper JP5. Its white cap can easily identify this jumper.

2. Put the jumper back to 1-2 to allow writing of new data into the CMOS memory.

Jan 07, 2010 | Soyo SY-K7VME Motherboard

2 Answers

I have an HP Pavillion a1250n which has a MS-7184 V1.0 that will not boot. When turned on the HP Invent logo screen appears with thw following at the bottom:(Esc=Boot Menu)(F1=Setup)(F10=System...


It sounds as though you might have a problem with BIOS.
You should remove your motherboard battery (little round silver disc) and if you can find (or Google motherboard model#) the CMOS reset jumper, you can remove the battery for 30 seconds and put it back in and reset the CMOS, then see if it boots. If it doesn't, you might need to flash the BIOS, which is not recommended unless you know what you are doing.

Nov 16, 2009 | Intel Motherboard

2 Answers

Power on password problem


Hi
To remove a bios password, you will need to disconnect the the cmosbattery (located under the system board) for 5 minutes with nopower attached to the laptop.

here is a manual how to find your CMOS battery.

Jul 10, 2008 | HP Compaq nx6310 Notebook

8 Answers

Where is the CMOS battery?


Yes that was the cmos battery, I'll see if I can find a better solution for this issue for you.

Feb 13, 2008 | Compaq Armada M700 Notebook

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