I changed the battery on motherboard, it started and showed "checksum error press F1 to continue" pressed F1 everything ok, set up the time, date then restart the system, it is working but there is nothing on monitor , the only way to power off is to cut off the power, new powering on is the same, only way to see the workflow is reinstall the battery and press F1, thanks for any ideas.

Hi names Rui,

For your problem the computer may display a prompt to press F1/F2 or any other key to enter setup each time the computer boots as a reminder on how to enter CMOS. However, if the computer asks to press F1/F2 (or another key) to enter setup and does not continue, this may be caused by any of the below reasons.

1. New hardware has been recently installed.
2. Error or confliction with settings in CMOS.
3. CMOS battery is bad or failing.

Solution:

New hardware has been recently installed

If new hardware has been recently installed into the computer, it is likely that you are receiving the prompt "Press F1 or F2 to enter setup" because CMOS needs to verify that the new detected hardware is properly being setup in CMOS. Enter CMOS setup and save the settings and exit. If you continue to get errors continue to the next step.

Error or confliction with settings in CMOS

If no new hardware has been added or you continue to get this prompt verify no error or conflictions exist in CMOS. Press the key to enter setup and verify that all settings are correct.

If your time and date are not set correctly, your battery is more than likely bad. Try setting the correct time and date, save the settings and then reboot. If after turning off the computer the time and date get reset again replace the battery.

If the time and date are correct and everything else appears to be correct try resetting the CMOS values to the defaults.

CMOS battery is bad or failing

If you continue to receive the prompt to enter setup each time the computer boots up and you have attempted to follow the above suggestions, your CMOS battery is bad. We recommended that the CMOS battery be replaced.

hope this will help you.

Hi.

The most probable reason you are getting the bad checksum error is you have to set the date and time because you have cleared the CMOS and reset the BIOS.
You should also get a message that says press F1 to load defaults or press a certain key to access setup. Access setup (BIOS) and set the date and time. That should take care of the bad checksum error.
Another good idea is make sure the motherboard battery is not dead either.



Regards.

The Checksum error basically shows that boot settings which were previously set has been changed or reset. This usually happens when the battery loses its charge and thus fail to retain the CMOS settings. This can also be caused by a power surge or a damaged motherboard. But most of the times it would be the battery problem.

You can try replacing the CMOS battery and enter the values back into CMOS or reset values to default. Then switch off and boot up again.
Hope this works. Good Luck. ~SmokinJoe~

Hi there,

When starting your PC, the following error message is displayed:

CMOS wrong
CMOS MEMORY size WRONG
CMOS Checksum Bad
CMOS checksum error defaults loaded
Warning! CPU has been changed please re-enter cpu settings in the cmos setup and remember to save before quit!
You are prompted to:

Press F1 to resume
Press F2 to load default values and continue


This is due to the fact that the CMOS, which contain data related to the BIOS, has been reinitialized and that your PC has been reset to factory settings.

Solutions:

Reinitializing the BIOS

• • Before making any costly maintenance try to reinitialized the BIOS.
• Change BIOS battery
  • If the problem persist this may be due to the fact that the battery powering the CMOS (when the computer is shut down allows the CMOS to store information), is depleted.
  • The CMOS battery is a small pin found on the mother board, you can refer to the manual provided with your motherboard to change it or have the nearby computer technician change it for you if you don't want to risk any damage.
  • More information with: Replacing the battery of your motherboard (CMOS battery)

Post back if it is not working we will be happy to help you.
Hope this helps.
Cheers!!!!

This message is usually accompanied by another more explicit, like: "Memory changed from 1GB to 2GB. Press F1 to continue". The message should display and go away after pressing F1. Since you cannot press F1 because the keys do nothing, chances are your keyboard is disconnected, which should display a message indicating this failure.
Try pressing the ScrLk (Scroll Lock) key as messages are being displayed to catch all
messages (they go by quickly) and stop them before they disappear.
If that's the case, then reconnect the keyboard and try again.
Good luck!

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Hi robynonis
Yes, definatly the cmos battery. Please make sure you replace with same type battery.
Regards Go-Tech

Whether it shows your cmos checksum error press F1 to continue or f2 to load default.? If this is the problem than kindly switch off the system check for the cmos battery and change the cmos battery and set the date and time properly in the bios and save it by pressing F10.This will resolve your problem.and if not than check the jumper setting on the motherboard is it set to clear cmos and if so kindly remove and set it properly to adjacent jumper ok. Have a nice time.

Press DEL to enter setup and set Reset to Defaults in Exit menu. If you have USB keyboard, make sure you enable Legacy USB and USB keyboard settings, save and exit and reboot.

I just had the CMOS checksum error while starting the computer, So pressed F1 and continued.. I just don't think it's the battery, because the computer is 2-3 months old, and all parts were new. I also have another problem. which is that it tells me at start upo the the IDE 80 connector cable isn't installed, or something like that, which prevents one of my hard drives to be found by windows....