Question about Toshiba Satellite 1805-S204 Notebook

3 Answers

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

Just turned on laptop and message reads **** bad check sum(CMOS) **** Check system. Then press F1 key. My question, is how do you check the system? computer has not been on for 6 months.

Posted by on

  • guitarrhythm May 17, 2009

    yes, thank you for helping

×

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Toshiba Master
  • 5,660 Answers

From Toshiba Support:
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

Posted on May 17, 2009

  • joecoolvette
    joecoolvette May 17, 2009

    What I don't deserve a rating?

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Toshiba Master
  • 19,396 Answers

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.

Posted on May 17, 2009

  • Level 1:

    An expert who has achieved level 1.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 5 Answers

Your tiny CMOS backup battery is depleated from being off so long and the settings it preserves are lost. If it is an old alkaline or Nickle-cadmium type, it may leak and eat the printed circuit board. Fumes are pungent and toxic. Ballery MUST be removed imediately unless button type. Button/coin batteries don't seem to dissolve as much. Replace it and blow the dust out. It's on the motherboard usually near the edge. Hope it's not soldered in. It may be possible to run it without the missing settings (and even with the CMOS battery removed)

THEN, the missing CMOS setup data must be replaced / restored.
Press F1 (or whatever your model's reset key is) durring the boot process and confirm yes to reset CMOS to factory configuration. (NOT the software installation) At worst it will just be closer than the error you have now. Most likely it will be fully functional. If you never upgraded far above the base configuration it could have been built with, it will be as strong and correct as possible anyway.

Posted on Aug 08, 2009

2 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

  • 442 Answers

SOURCE: LAPTOP SAID "BAD CHECK SUM(CMOS)

we should reset BIOS settings, please follow the instructions below.

Please click on the following link

http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=SB&os=&category=&moid=196385&rpn=PS140U&modelFilter=1400-S151&selCategory=2756709&selFamily=1073768663#

you will see a page in the toshiba website, click on product guide

go to page 196 & 197 to access settings and reset the same. If this does not work you have to change the RTC battery (referred in page 119)

Posted on Nov 21, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

How do i remove and replace the cmos battery


If your computer is losing its time or date settings, or you are receiving a message CMOS Read Error, CMOS check sum error, or CMOS Battery Failure, first try leaving the computer on for 24-hours. In some cases, this can charge the battery and resolve your problem. This fixes most CMOS battery issues on computers left without power for several months. If this does not resolve your problem follow the steps...

http://www.computerhope.com/issues/ch000239.htm

Oct 02, 2014 | Lenovo ThinkPad R60 R60e T60 T60p T61p...

1 Answer

My Laptop is Dellstudio15,When I swith on my laptop is showing error while booting it self is: Check date and time settings,System CMOS Checksum is Bad.Please help on this.


This error message means that its time for you to replace you CMOS battery.

CMOS battery is a small battery on the system board that provides power to the Complementary Metal Oxide Semiconductor (CMOS) chip, even while the computer is turned off. This chip contains information about the system configuration (e.g., hard disk type, floppy drive types, date and time, and the order in which the computer will look for bootable disks). The CMOS battery allows the CMOS to preserve these settings.


Hope this information willbe helpful. Thank you for using FIXYA.

Apr 13, 2011 | 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

1 Answer

On starting my pc error come CMOS check sum bad. usb power overload. system will shutdown in 15 sec. and system turns off after that. i have already change the cmos battery. please give some useful...


Check your system USB connector having any short circuit, you can test it by removing all USB connections. Then again it showing USB over current error it is related to your Motherboard ICH problem, motherboard to be replaced

Sep 25, 2010 | ASUS A8N-VM Motherboard

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

2 Answers

COMPUTER CHECK SUM ERROR'S ?


if you can enter bios (usually by pressing f2 or del), then load the default settings, otherwise, you will have to position the jumper properly, instructions for that are as follows.

1. Touch an exposed metal part of the case to ground yourself.
2. Unplug the power supply from the wall.
3. Move CMOS reset pins to short pins 2 and 3, then wait 10 minutes.
4. Replace CMOS reset pins back to 1 and 2.
5. Replug the power supply and boot.

Jan 20, 2009 | Acer Aspire™ T180 PC Desktop

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

Not finding what you are looking for?
Toshiba Satellite 1805-S204 Notebook Logo

2,003 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toshiba Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18389 Answers

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

k24674

Level 3 Expert

7993 Answers

Are you a Toshiba Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...