Question about Toshiba Satellite 4020CDT/6 Laptop Universal AC Adapter 15-17v (AC22VPN7BHNXR)

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Bad check sum(cmos)

Turn computer on it reads bad check sum (cmos) check system . then press the f11 key

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Replace the backup battery.

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Bad check sum cmos


This error is not the same as a CMOS Checksum Error, which refers to corrupted values of the CMOS settings, the ones you set through the BIOS setup program. This error means the contents of the BIOS code itself are damaged.

The BIOS ROM chip on the motherboard is probably faulty. It could also be another component on the motherboard.

You should make sure that all of the BIOS settings in the system are correct, by rebooting the system, going into BIOS setup and double-checking all the values (hopefully against a recent


If you have reset the CMOS memory you need to go into the BIOS setup screen and reconfigure the BIOS. To do that you need to press a key while the computer is booting. Usually F2 but can be other keys. It should tell you on the bottom of the first screen which key to press to enter BIOS setup.
If you don't know the settings the should be one for optimal defaults - use that one. You will also need to reset the time and date.
Save, Exit and re-boot and everything should then work.

This error is not the same as a CMOS Checksum Error, which refers to corrupted values of the CMOS settings, the ones you set through the BIOS setup program. This error means the contents of the BIOS code itself are damaged.


During the boot process you will see on the screen a certain key to press to enter setup
Press and hold that key during the boot up process to enter BIOS you can load failsafe defaults or load optimized defaults ,press escape then press f10 to save to cmos to restart
You will also need to set the time and date

In the main or system setup screen you should be able to see the date and time Using your arrow keys navigate to the date and change the date. Once highlighted on the month, day, or year, press your arrow keys or your page up / page down keys to change the date.
hope this helps you

Nov 18, 2011 | Toshiba Equium 2000 (PV1065E0-011FR) PC...

1 Answer

How can i reset my emachines e525 laptop to factory settings as i have tried and i cannot find out how, i also forgot to create a backup disk so i can not use one of them.


Have you try to press the F11 button ?
Turn off the computer,press the "Power" button. Wait for the eMachine's computer to reach the screen that reads "Press F11 to start recovery." Once this screen appears, press the F11 key on the keyboard multiple times to make sure that it registers. If the recovery screen does not come up, you will need to turn the computer off and back on again and attempt to press the F11 button again when the prompt appears.
After doing that is only necessary to follow the steps.

Jul 11, 2011 | Computers & Internet

2 Answers

When i turned on my computer message RTC battery is low or CMOS checksun is inconsistent press f11 key to set date i have tryed f11 and had it pluged in all night still same message.


Means your CMOS battery is flat and will need to be changed, as that keeps the date and time saved at all times if it dead then every time you turn off the computer the date and time will not be saved and have to re-set it. changing the battery will solve this problem. Kronoguy

Jun 29, 2011 | Toshiba Computers & Internet

1 Answer

Have been given a satllite 2520cdt when i turn it on it opens up to **** Bad check sum (CMOS) **** Check system Then press (F11) key can any one tell me hat i need to do please


Looks like the CMOS battery is dead. Open up the case and check the motherboard. You will find a small battery. Buy a new one and replace it and see what happens. www.tigerdirect.com will have what you need or if you are lucky radio shack will have it.

Chris Thrash
B52Computers

Jan 10, 2011 | Toshiba Satellite 2250XCDS Notebook

1 Answer

PCCHips M955G V:3.0A. When i put on the system, the windows go down and the led shown a lot of messages. The main problem is: CMOS ckecksum BAD.


You may have damaged the motherboard or memory... However, I don't see how you inserted the memory backwards. 168-pin memory is keyed and can usually be inserted only one way. A CMOS check sum error is usually caused by corrupted data in the CMOS memory. When the computer boots it adds all of the ones and zeros in the CMOS and drops the carry bit. It compares the resulting sum to a like (we hope) sum that was generated when the CMOS data was produced. If the two do not match, the CMOS is presumed corrupted, and an error is generated. The corruption can be caused by defective CMOS memory or power problems caused by a shorted motherboard, an expansion card that is not properly seated, a defective component, etc. I would check the battery with a multimeter and make sure it is good and installed correctly. Some older motherboards have a CMOS battery soldered onto the motherboard and have a jumper which must be changed to use an external battery. The battery on the motherboard should be removed if an external battery is installed. It can leak and damage the motherboard beyond repair. Do not use a soldering iron or anything hot to remove a battery form a motherboard. The battery can explode. I use a combination of pliers and diagonal cutters to remove these batteries. The computer must be unplugged when doing it and care must be employed (not an operation for an overly ambitious gorilla). Some batteries include the system clock, are usually black and rectangular, soldered to the motherboard, and are supposed to have a 10 year or greater lifetime. When they fail, the motherboard is usually a goner. Most motherboards have a jumper, which can be used to discharge (erase) the CMOS memory, and this may fix the problem. Be sure the computer is off and unplugged, move the jumper to the discharge position, wait 10 minutes, move it to the normal position, attach the power cord, and turn-on your computer. Some motherboards can be damaged it the computer is powered on with the jumper in the discharge position

Sep 30, 2010 | PC Chips M955G Motherboard

2 Answers

I get the message "Bad check sum (CMOS)" Model toshiba tecra 730XCDT


hi friend,

Probably a dead Motherboard battery. Need to enter the BIOS screens and reset values. Especially the time and date. Maybe the boot order and if using USB KBoard enable legusy USB devices. This will occur each time your friend shuts down and reboots until the battery is changed.
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.

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regards,
sivaranjini

Aug 10, 2009 | Toshiba Tecra 730CDT Notebook

3 Answers

Turn on computer and message reads ****bad check sum (CMOS) ****


That means that after computer had been off for a long time the CMOS battery has drained, and CMOS (BIOS) settings had been reset to default.

Usually the computer will work fine after pressing F1, but you may get wrong date and time.

Try charging battery completely, often the problem disappears, if it does not , then the choice is between pressing F1 each time you start the laptop, or disassembling the laptop and replacing CMOS internal coin battery, located on the lower side of the motherboard.

May 17, 2009 | Toshiba Satellite 1805-S204 Notebook

2 Answers

The battery will charge but will not turn on unplugged


This seems like a bad battery again. Take it back witht he laptop and have the shop or store test it. This is not a software issue...

Mar 05, 2009 | Toshiba Satellite 1405-S151 Notebook

1 Answer

RTC battery "bad check sum (CMOS) message


flashing your bios might solve your problem

Feb 17, 2009 | Toshiba Tecra 9000 Notebook

1 Answer

RTC battery "bad check sum (CMOS) message


your cios have properly lost the info.

just setup the date.. that should be enough ..

Or write to me and I will guide you.
CS.

May 18, 2008 | Toshiba Satellite 2400-S251 Notebook

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