Question about ASUS P4P800 SE (890552603657) Motherboard

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Cmos checksum bad

I bought a new board, processor and ram P4M900T-M and after installing the board i am going to install my os and everything was fine until it cut off and restarted saying that all my hardware was fine and then i saw cmos checksum bad what can i do

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Re: cmos checksum bad

Here is an explanation of your problem.

Posted on Dec 14, 2007

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Dell Inspiron 530. At start up gives CMOS checksum error defaults loaded. Options press F1, F2 or F12 computer does not react. Has new CMOS battery. RAM OK. Did CMOS clear and password reset. What else can...

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, 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)


Mar 17, 2013 | Dell Motherboards

1 Answer

P4M900T-M2 Intel Pentium R dual CPU E2160 1.8 Ghz default BIOS Setting

The CMOS Checksum Bad Error during the pre-booting process only indicates that the CMOS battery is exhausted and it can not no longer save the current BIOS settings, Time settings and many more things.

The first and and the only way, according to me, to solve this problem is to replace the CMOS battery.

Please let us know, if this solution have helped you.

Hope this helps, Mrityunjay.

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I have asus p5gc-mx motherboard when i start my pc it show some mess like,,,,,00 mass storage devices found and configured ,,,,and CMOS checksum BAD ,,,,,,,,, somebody know what is this and help me to fix...


Checksum errors are almost always an indication of RAM problems. Have you replaced the RAM lately? Or perhaps had modules out and not reinstalled properly? Is this a new board?

No mass storage devices looks like there are problems with connections or hardware problems with your hard drive.

Are you setting up a new board or did this just happen out of the blue?

Can you get into the BIOS setup when it begins booting?

Any other information would be helpful.


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:CMOS Checksum Bad error Hi, My system had intel c2d 2.13ghz processor and 2gb ddr2 ram to begin with. I recently added 2gb more (both are 667 mhz). Now i'm getting an error while booting which says CMOS...

Yes--most probably a memory error.
If you added memory and kept the original memory, they might not be compatible.
Try running with only the old memory.
Then try running with only the new memory.

Bet both work. But not together.

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When i replace and upgrade my ecs p4vmm2 ram up to 1gb..first it enter os but when i restarting im stuck with checking nvram" done with re installing the usb wire,reseting cmos..unplugging...

i think u are trying to upgrade ur ram with ur existing ram, if this then plz check ur old ram frequency and then select another ram with same frequency, means u have to install rams with same frequency. i hope u can understand what m i saying.

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The new RAM module could be faulty or the second memory slot is faulty.
Try removing the original 1Gb memory module and inserting the new memory module in its place to see if the computer boots up normally. If it doesn't then then new memory module is faulty.

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Ok I am going to reach on this, I remember those boards, I think what you did was knock off a jumper on the board that sets the speed on those processors, but first check that you put the jumper on the cmos back the way it was, you may have cleared the cmos and not returned the jumper to the default position, take the battery out and check the jumper again, it should be one or the other. if you find a couple of pins that are bare on the board, the jumper that I mentioned at first may have fell off when you cleaned it.

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If your CMOS batt is ok, then try flashing your BIOS

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Cmos checksum error

cmos checksum errors are caused by a bad battery.
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