cmos checksum error

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Answer by vengeance
Submitted on 9/25/2004
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Issue When you turn your Toshiba computer on, you see an error message like: ** Bad RTC battery Bad Checksum (CMOS) Check system, then press [F1] key The Real Time Clock (RTC) battery provides power for the internal clock/calendar and for maintaining system configuration settings. This error can occur when a machine has been left turned-off for an extended period of time (around a month), and is the result of a depleted RTC battery. Other symptoms include not being able to execute Windows Update properly, errors/problems executing application software (like Norton Antivirus), and the appearance of the Windows XP "Desktop Clean Wizard". Resolution This condition is easy to fix in 3 basic steps: Reset the BIOS defaults Set the correct date and time in Windows. Charge the RTC battery Please follow the detailed instructions in the next section. Procedure Set BIOS defaults Press the [F1] key as instructed in the error message: Bad RTC battery Bad Checksum (CMOS) ** Check system, then press [F1] key In the BIOS setup screen press the [Home] key to restore the default values, then press the [End] key to save and exit, then the [Y] key to confirm and restart the system. Set the correct date and time in Windows As Windows starts-up, you may see an error message about an "Invalid System Time". Go ahead and click "OK" to clear the error dialog. Open the Windows Control Panel and open the "Date and Time" control by double-clicking its icon. Set the correct date and time, then click OK to save. Charge the Real Time Clock (RTC) battery To charge the RTC battery, connect the AC adapter and turn the computer on (both the DC IN and Power LEDs must be green). Leave the machine on for approximately 24 hours to ensure a full charge in the RTC battery. Please note that the RTC battery does not charge while the PC is turned off, regardless of whether the AC adapter is connected or not. Other Information: If, on subsequent reboots, the "Bad RTC Battery" error persists, it's quite likely that you actually do have a bad RTC battery. If that's the case, you should contact a Toshiba Authorized Service Provider to have the system serviced. Windows XP Desktop Cleanup Wizard The first time you reboot Windows XP after resetting the system clock, Windows XP may try to run the "Desktop Cleanup Wizard". Simply Cancel the "Desktop Cleanup Wizard" at the first dialog. If you do manage to clean your shortcuts from the desktop and want to recover them, you will find them in a folder called "Unused Desktop Shortcuts". You can recover them as follows: Double-click to open the "Unused Desktop Shortcuts" folder Click to expand the "Edit" menu, and click "Select All" Drag the selected items back to your desktop Close the "Unused Desktop Shortcuts" folder. You can delete this folder if it is empty.

Answer by Raja
Submitted on 7/14/2006
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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. Disconnecting power from computer without shutting down computer Solution: Bad or old CMOS battery 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. 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. 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. Additional information about replacing the CMOS battery can be found on document CH000239. Disconnecting power from computer without shutting down computer 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. If the CMOS values have become corrupted entering the values in CMOS setup and saving and exiting CMOS should resolve your issues.

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Question by ashish kulharia
Submitted on 1/17/2004
Related FAQ: comp.sys.ibm.pc.hardware.* Frequently Asked Questions (FAQ) Part 1/5
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cmos checksum error

Answer by PDavisA+
Submitted on 1/24/2004
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checksum errors often occur when power to the cmos/bios chip is cut. firstly check your BIOS by pressing delete during the first few seconds of the startup process (memory counting, DOS screen type thing) and check the CMOS settings such as time and date. If errors continue, replace the battery to the CMOS. the battery is usually a flat round battery on your motherboard. Sometimes flashing your bios is a good solution, assuming that your bios is new enough to be flashed through a program rather than the manual method if all this fails i suggest you paint your computer a nice colour and use it as an attractive, giant paperweight.

Answer by ramesh shinde
Submitted on 4/17/2004
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i suggest the last one as the best soluion ie., use it as a papper weight. another solution is remove every thing from the cabinet and use it as a flush tank. :p

Answer by mostafa ashour
Submitted on 4/20/2004
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This could be due to a hardware failure, incompatible hardware, or a BIOS Failure. 1. Try removing all unrelated hardware, like modems, sound cards, hard drives, CD-ROM, etc. 2. Sometimes this could be due to a bad power supply unit - try replacing it. 3. If the above mentioned steps failed, you In case of a corrupted BIOS you need to send back only the BIOS

Answer by archana
Submitted on 10/19/2004
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I encountered a similar problem.Changing the CMOS battery helped.Sometimes the battery is loosely connected and just securing it fast solves the problem..try it

Answer by loot
Submitted on 11/30/2004
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i've jus assembled a new comp n decided to use back my old vibra 128 card. the cmos error will come out whenever i start the comp, but the prob dissappears when i remove the soundcard. any solutions for that?

Answer by Leo
Submitted on 12/3/2004
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cmos checksum error, del to enter setup 02/07/2002-693a-686--6a6lca-7k This is a pentium 3 466emhz (66+ 7.0 Plase Help mr solve this problem. My E mail gerdungl@juno.com Leo

Answer by Bad Cat
Submitted on 2/5/2005
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I had this problem and found out it was a bad memory stick

Answer by Hammad Raza Khan
Submitted on 2/10/2005
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well painting isn't a good option. even if your bios are showing nothing i.e, they are totally dead, they still can be made to work. there are certian arcade game repairers they have consoles that can program EEPROMS (BIOS). they can totally re-flash your bios.

Answer by lendl
Submitted on 3/4/2005
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checksum errors often occur when power on CMOS it says checksum error press F4 or F1 to continue then if you have a new battery inserted at Motherboard it cannot apply you new battery and wasted your time and your money to buy CRO2032 batteries and how can i fix that?????

Answer by diver697
Submitted on 3/5/2005
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when a cmos checksum error shows you could try checking your bios settings,if on it is showing that you have a floppy present and you do not have one in your machine then change settings from floppy to none then save and retry.Have found this has worked on my own board which is a aopen.

Answer by lords89
Submitted on 5/18/2005
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ussally all u have to do is go to your java applet control pannel and click cache.after that you hit veiw u should then highlight every1 and hit delete

Answer by Cesar
Submitted on 8/29/2005
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Microsoft gives an answer to the problem for computers that have been upgraded from Windows 98 or Me to XP. The answer is currently at: http://support.microsoft.com/default.aspx?scid=kb;en-us;326687&Product=winxp If the page above does not work anymore you should go to the http://support.microsoft.com/ page and perform a search about the error. For the Windows XP upgrade problem Microsoft suggests to replace a file that causes the error. In Windows XP you will need the Windows XP CD and a Windows 98 or Me startup disk to extract and replace the name of the file is User32.dll.

Answer by shiva
Submitted on 1/16/2006
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ERROR CAN BE OVERCOME BY ENTERING BIOS AND CHECKING CMOS SETTINGS LIKE DATE AND TIME.YEAH IT WORKS, TRY IT.

Answer by vassyman
Submitted on 3/12/2006
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My sugestion of this type of error (witch I just had it) is to change the CMOS battery. Of course the chance for a bad power supply is about 50%. So 1 of 2, or even both.

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Answer by R0CK3TSBABE
Submitted on 7/7/2006
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This can also occur when your husband throws his p.c. across the room in temper and you stay up till 4am straightening it and making it perform correctly.

Answer by showergurl
Submitted on 7/22/2006
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You know I experience this problem too. My computer suddenly got errors in BIOS but after it restarts it goes normal again. I think the cause was the battery or maybe the Power Supply because it automatically resets it's settings (SETUP)

Answer by my say
Submitted on 12/2/2006
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hi there Guys, I had that problem before. I tried everything you Guys said, nothing worked, finaly i realised the my processor hada a couple of bad pins. I had to buy a new CPU. Regards Sorry about my spelling

Answer by Lobo
Submitted on 3/25/2007
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Memory stick may be the problem, remove and check or replace the memory.

Answer by Might
Submitted on 4/11/2007
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i replace the battery to the CMOS. and also updated my BIOS.........after doing so my computer gives the same error...CMOS checksum error

Answer by trechan
Submitted on 5/5/2007
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im getting the same exact error yet cannot fix it due to alot of things i mostly get errors, copy bios error or BIOS rom has something wrong with it