I have a phoenix d888 bios with a msi 875G motherboard. now it shows a message saying "cmos checksum error default loaded", in the post screen at startup. i replaced the battery and clear the cmos but it didnt help.
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When a Power Supply is plugged into power, there is a constant 5 Volts present. The 5 Volt Standby Power.
You press the Power On button. This in turn presses against the Power On switch, located inside it's plastic assembly.
The Power On switch is a Momentary Contact Switch. Temporary closing it activates the Soft Power On circuit. A 5 Volt circuit that utilizes the 5 Volt Standby Power.
The Soft Power On circuit 'excites' the Power Supply, and turns it on. (Sounds like a seedy novel)
The first chipset (Integrated Circuit) to receive power is the BIOS chipset. The Basic Input/Output System program is initialized.
BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor on, and hands the computer over to the Operating System.
A checksum is computed as an error-detecting code, to protect the BIOS settings stored in CMOS. Each time the computer is turned on, this number is re-computed; and checked against stored values.
If they do not match an error message is generated, to tell you the CMOS memory contents may have been corrupted; and therefore some settings may be wrong. Your BIOS assumed the settings were incorrect, and loaded BIOS default settings; stored in BIOS.
(Default = factory settings)
CMOS Checksum Error Defaults - Loaded
New battery? Nope didn't help. Clear CMOS, and password reset? Nope didn't help.
Leaves Virus as the problem, or hardware component/s on motherboard; are bad.
My thoughts? Bad motherboard.
("BAD motherboard. NO,...........you know you have been bad,....don't give me that look. You're a bad motherboard."
That's my diagnosis.
(Unless you put the CMOS battery in upside down. + goes UP)
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.
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.
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.
Make sure the battery your using is brand new. If it is then go ahead and get into the Bios and make sure the date and time is set properly. Once you do that then go ahead and save the changes and exit.
After this go ahead and see if the CMOS exit checksum defaults comes up if not then go ahead and turn off the computer and unplug it. Then after about 5 minutues plug the computer back up and turn it on and if the message doesn't come up then its resolved.
If the cmos checksum error comes back up then try a brand new battery, should be a 2032 battery and then go thru the same steps in setting the date and time and save changes and exit and if the message doesn't come back then unplug the system again and leave it unplugged for 5 minutes. Now plug it back up and if the message stays away the problem is resolved. it the message comes back then that means the motherboard isn't reconizing the batteries and the motherboard would need to be replaced.
If you are using an old computer, there’s a possibility that you already encountered this error message during bootup; “CMOS checksum error – Defaults loaded”. At this point, the PC will halt its operation and requires you to press F1 to continue or DEL to enter setup (mostly but also depends on motherboard) to proceed.
This is caused by incorrect or corrupted CMOS values. BIOS settings are stored in CMOS. Each time the system is booted this number is recomputed and checked against the stored value. If they do not match, the error message will be displayed.
For most cases, this is caused by the motherboard battery. Buy a new one to any electronic retailers in your area and replace it. Turn on your computer and press the stated key to enter the BIOS setup. It can be DEL for some or F2 but this depends on your computer. On the BIOS menu, try to change the DATE and TIME settings because their values are reset to different value. Most settings are set to default so leave it as it is. Save the settings and reboot your computer.
I had a similar experience after upgrading my RAM. When you reset your CMOS and have default settings maybe you should check if your RAM timings are correct. I could not get mine to load with both sticks in until I fixed the timings from the default settings.