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I have a Probook 4520s checksum error on cold boot. Time and date is reset to 1979 but everything works fine after adjusting both date and time. I changed the CMOS battery and flashed the BIOS. Same error on boot up. Next: Could my bios chip be defective? Where is it on the motherboard? Can it be changed or is it soldered down?

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You need to replace the small bios battery or CMOS battery if you changed it and it didn't work the battery was probably dead. Pull and test the battery. If the battery tests good yep you may have a board motherboard problem. Check the new battery first test any new battery it could be dead on the shelf always good to find out.

Posted on Oct 21, 2013

  • Michele Cooke Oct 21, 2013

    I multi-tested the battery. It actually showed a "6". Is that even possible on a 3 volt battery? Maybe I was using the wrong setting. I also tested the leads on both sides of the battery bay because the previous battery had leaked. Also got a good strong reading. So somewhere on the motherboard I must have an issue, right?

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Posted on Jan 02, 2017

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  • 23 Answers

SOURCE: Reset my Compaq D51C PC Desktop BIOS

try shutting down, remove nickle sized battery for 10 minutes and replace.

Posted on Jan 24, 2009

lmarrero
  • 42 Answers

SOURCE: Turned off PC one night working fine. Next time

Have you tried booting it from yor CD drive with bootable software?

Any led flashing anywhere in the computer?

If not, we are talking about energy problem. Try fitting the energy cord firmly, try connecting the battery charger in a different power outlet.

Posted on Aug 26, 2009

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1 Answer

Hp probook 4520s charging time more brightly .battary off time darknessly


Laptop screen is normally brighter when it is connected to the charge adapter. When the laptop is running on the battery it is usually a little dimmer to save battery power, you can adjust the screen brightness even on battery power. To adjust the brightness hold down the Fn key and press one of the function button keys it maybe the F7 or F8 key it will have a symbol on the key to indicate the screen brightness.

Dec 18, 2012 | HEWLETT-PACKARD ProBook 4520s

1 Answer

Cmos checksum error-defaults loaded


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.

Make sure the battery has plenty charge or remove the battery for a while, about 5 minutes to see if that restores it some motherboards cmos batteries are soldered in

You could check the site for the machine vendor to see if there is a reset jumper.

If that doesn't work then you will need to refresh the BIOS


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 the Delete or 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.
.

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.

Press F10 Save, Exit and re-boot and everything should then work
hope this helps

Aug 03, 2012 | Dell Computers & Internet

1 Answer

How do i locate the hp probook 4520s BIOS password jumper on the motherboard


4520s.
you failed because of one reason, you asked on fixya not HP'
why ask here, there are no HP(few) folks here, they are all over at HP, real forum.?
bios resets are tricky,
the new rules changed with UEFI BIOS and or TPM chips added.
back in 2007 the mobo had reset jumper, (mine desktop does)
but not my 2008 elitebook laptop, due to the TPM rules.

first the link to your books
https://support.hp.com/us-en/product/HP-ProBook-4520s-Notebook-PC/4145198

those cover most issues, you will have. all by HP direct,
page 126 here is not too clear;.
the answer is here
your PC is fully locked now, there is no way to reset it .
without HP direct intervention (fixya can never ever do that)
the send you a special binary flash file that only works on YOUR PC (a fact and is by DESIGN)

https://h30434.www3.hp.com/t5/Business-Notebooks/Probook-4545s-Bios-Password-reset/m-p/6350164#M147169


never use a BIOS password, unless you write it down and hide the paper in a book you know, where it is. (got books?) i know books are now (dead technology but)>?
if you guess and start flashing BIOS, you will BRICK THIS PC.

Oct 20, 2017 | HEWLETT-PACKARD ProBook 4520s

1 Answer

Bios rom checksum error, boot block bios vI.0


Error BIOS ROM CHECKSUM - SYSTEM HALTED.
Cause Bad Hardware
Solution Unfortunately this indicates that your computer BIOS ROM chip or Motherboard is physically bad. It is recommended that you contact your computer manufacturer or take the computer into local service center for repair.
If you wish to repair this issue yourself the motherbard will need to be replaced.
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

Apr 14, 2012 | ASUS A8N-E Motherboard

1 Answer

Reason for showing "check main


your bios has been damaged the bios chip on your motherboard could be damaged to check it

restart your compuetr during the boot up process you will see a certain key to press to enter set up (bios) press and hold that key to enter bios using the arrow keys scroll to load optimised defaults

You will also need to reset 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.
Save, Exit and re-boot and everything should then work.

hope this helps you

Sep 23, 2011 | Gigabyte GA-G31M-ES2L Motherboard

1 Answer

Every time I reboot my pc I get the checksum error, all my defaults are loaded and also cant get to the setup


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
click start control panel date and time you can make your adjustments to the date and time from there also right click on the date and time on the bottom toolbar (bottom of screen) you should see Adjust date and time tab
hope this helps you

Sep 14, 2011 | Computers & Internet

1 Answer

Compaq Presario 2500 stopped loading windows XP with a prompt STOP: c0000221 {bad Image Checksum} The image COMCTL32.dll is possibly corrupt. The header checksum does not match the computed checksum.


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 to press delete to enter setup
Press and hold delete 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
click start control panel date and time you can make your adjustments to the date and time from there also right click on the date and time on the bottom toolbar (bottom of screen) you should see Adjust date and time tab
hope this helps you

Sep 09, 2011 | Compaq Presario 2100 and 2500 ,NX 9000...

2 Answers

Checksum error,boot failure on start up..wont continue..some beeping sound


make sure the compters ram modules and Cmos are securely seated with no dust in the sockets 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.
click start control panel date and time you can make your adjustments to the date and time from there also right click on the date and time on the bottom toolbar (bottom of screen) you should see Adjust date and time tab
Save, Exit and re-boot and everything should then work.
During the boot process you will see on the screen to press delete to enter setup

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1 Answer

Mainboard GA-G31-ES2C Warning: Backup BIOS checksum error BIOS Auto-Recovering...


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.
During the boot process you will see on the screen to press delete to enter setup

Jul 23, 2011 | Gigabyte GA-G31M-ES2L Motherboard

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