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How can i fix a cmos sum checkon a computer that will not boot up

Where do i start and how do i proceed

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  • billandjohan Jan 05, 2009

    I just changed the battery and this problem started

  • billandjohan Jan 05, 2009

    If anyone needs to identify their chipset or motherboard mfg...check www.wimsbios.com it has a super writeup and charts to help you identify them.

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  • 37 Answers

It may simply be necessary to replace the flat battery on the motherboard.

Posted on Jan 05, 2009

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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...

Tip

SEEK ZERO ERRORS


DISKETTEDRIVE ZERO ERROR. OR CHECK SUM FAILED ERRORS . SIMPLE FIX CHANGE BOOT ORDER TURN OFF A DRIVE AND CHANGE CMOS BATTERY . FIND CLEAR CMOS PINS ON MOBO AND SWITCH JUMPERS . RESTART AND RUN

on May 15, 2010 | Computers & Internet

1 Answer

Laptop wont start



This issue is often caused by either an incorrect setting in CMOS Setup or a bad boot device, such as a bad hard disk drive.

  1. Verify your boot options are properly set in CMOS setup. I recommend having the CD or disc drive as your first boot device and then hard drive as the second boot device.
  2. If your CMOS Setup has an option to boot from the LAN disable this option.
  3. If you have changed any CMOS settings, make sure to save and reboot the computer.

If this does not resolve the issue, try resetting the CMOS values to the default settings, save and exit.
If this fixes the problem but it reoccurs again later you main need a new cmos battery. Or keep your battery always slightly charged.

Nov 16, 2011 | Toshiba Computers & Internet

1 Answer

How can i reformat my pc?


Hi Good Day,
First you have to choose the operating system you suitable for you and ask the your nearest computer technician if it is compatible to your system specification.
Second you have to boot it from CD... There are to options in going to boot setup: 1. go to CMOS setup by pressing the F2 key or delete key the select the tab key, look for the first boot, choose CD/DVD rom. After it save your settings the proceed booting from your CD. start reformat. 2. Press F12 or sometimes F9 it is depend in your system bios. choose boot from cd. start reformat.

Apr 20, 2011 | Computers & Internet

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

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

4 Answers

How do i reset CMOS on kv8 pro? getting POST code 25 comp not booting up, tried replacing ribbon cable, also unplgged keyboard. HELP!!!


unplug your computer, then you will find a small battery on the motherboard, this is a small silver disk shape. you need to remove this by pressing the clip to its side, this lets it spring free. you then need to locate the cmos jumper. this is a 3 pin stand off with 2 pins already covered by a plastic sleeve. remove the sleeve and place it over the other two pins, wait a few seccons then put everythinbg back to the way it was. put the jumper back in its origional position and re-attach the battery making sure it is the right way up. plug in your system and give it a try.

Dec 28, 2008 | Computers & Internet

1 Answer

Check sum error denioted in win xp


you internal cmos battery is flat needs replacing. then reset time and etc in bios

Oct 10, 2008 | Televison & Video

1 Answer

Asus Mobo Will Not Boot After Memory Upgrade


not right ram gotta use samusng low density sum mobo so picky

Jan 20, 2008 | ASUS P4PE-X Motherboard

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