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KV7-V Motherboard with CMOS Checksum Error

By winglet
Feb 25, 2005
  1. I have a problem.

    I just bought a brand new kv7-v motherboard and AMD Sempron 2600+ from tigerdirect.

    I went home, mounted the board properly, plugged everything correctly (I think/hope).

    When I start it up, it seems to start fine with the default settings...but it gives me the CMOS Checksum error and I have to push F1 to continue.

    When I go into the BIO and change it from the defaults to user define with the EXACT same frequency, my computer shuts off and sounds an alarm.

    I have tried changing the power supply but I still get the same problem....

    Can anyone help me?
     
  2. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    First turn off the power

    Remove the battery let it sit

    Replace the battery after about 30 seconds

    If you still get this error replace the battery itself

    let us know
     
  3. winglet

    winglet TS Rookie Topic Starter

    battery?

    Where is the battery located? Or how does it look like?....

    Thanks
     
  4. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    Open your computer look inside it is a round shiny thing toward the bottom .. It will show you in your manual...
     
  5. winglet

    winglet TS Rookie Topic Starter

    hmm, the motherboard is brand new, do you think it could be the CMOS battery? Maybe it's something in my frequency settings. Does anyone know how I can find out what my settings should be at?
     
  6. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    HEllo again

    Look in your motherboard manual and follow the BIOS set up to a "T" check at AMD web site for the settings on that procrossor you will find the FSB and the mulitplier there .I do believe that is a either a 266/333FSB cpu and Yes Just becuse the motherboard is new does not mean the battery is,The battery itself is a pretty cheap fix ..

    Keep us posted
     
  7. winglet

    winglet TS Rookie Topic Starter

    might be a silly question
    but I can only change my FSB frequency from 100-199...
     
  8. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    First Nothing is a silly question ! This is how one learns

    Your FSB has settings from 100-199

    if your Cpu is a 266 FSB total this has to be set to 133

    if your CPU is a 333FSB total this has to be set to 166

    Soon as we know what your FSB is of the CPU you have now is like I said it is either a 266/or a 333fsb if you have anymore questions please feel free to email me and place FSB in subject line...
     
  9. winglet

    winglet TS Rookie Topic Starter

    On AMD's website
    it says that the AMD Sempron processor supports 333MHz...meaning that I should set it to 166 Hz? just wanna double check
     
  10. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    333 =166 yes that is what you want to set it too.... :grinthumb
     
  11. winglet

    winglet TS Rookie Topic Starter

    The FSB is set to 166 and now it starts fine without the alarm
    however, under windows system it says it's running as a 1.09 GHz...but with the 2600+, it should be running at 1.83 GHz?

    What is wrong?
     
  12. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    Increase the multiplyer one notch .
     
  13. winglet

    winglet TS Rookie Topic Starter

    btw, my motherboard manual doesn't have instructions on how to setup the bios, it just lists what the bios settings mean
     
  14. winglet

    winglet TS Rookie Topic Starter

    as well, with my FSB clock at 166 Hz
    it still gives me the CMOS checksum error
    and my multiplier factor cannot be changed...it won't let me change it, the only thing I am able to change is the Ratio(FSB:AGP:pCI) which is currently set at 5:2:1
     
  15. winglet

    winglet TS Rookie Topic Starter

    As well, I have changed the CMOS battery as well
    and it still doesn't work... :(
    This is driving me nuts
    I have to clear the CMOS because it's shutting down and sounding the alarm
    and now it gives me that CMOS checksum error again
     
  16. winglet

    winglet TS Rookie Topic Starter

    okay, well, I took it in and the guy didn't know what was wrong with it
    He took off the cpu fan, and reattached it...and now all of a sudden it seems to work okay? I'll never know what it is, but thanks so much for your help....I learned quite a bit from you guys and I'll make sure I'll post future problems that may come up. Thanks!
     
  17. luvhuffer

    luvhuffer TechSpot Paladin Posts: 443

    Hi Winglet. tbrunt3 was doing such a good job I hate to but# in, but if you go to this link, you will get a much better explanation of all those BIOS settings. What they do and what the most common settings are. The user guides from all these mobo makers leave a lot to be desired in terms of BIOS info.

    http://www.rojakpot.com/freebog.aspx
     
  18. winglet

    winglet TS Rookie Topic Starter

    oopsie

    lol, well, not all of my problems are over yet! The computer now seems to restart on its own....any clues?
     
  19. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    Random reboots usually sign of faulty power supply get it checked or invest 14.00$ to buy a powersupply tester from your local computer store and check it yourself.
     
  20. winglet

    winglet TS Rookie Topic Starter

    can't be it?

    I just bought a brand new power supply....maybe a week old
     
  21. luvhuffer

    luvhuffer TechSpot Paladin Posts: 443

    how long a time between the first boot, and the restart. Does it make it to the OS desktop?
     
  22. tbrunt3

    tbrunt3 TS Rookie Posts: 313

    Well Lets run memorytest 86 get it here We will start with the memory see it all test out ok since the power supply is brand new.But to be honost I seen them bad out of the box ...

    Let us know how the test goes...
     
  23. winglet

    winglet TS Rookie Topic Starter

    another random thing
    if I am able to run Counterstrike before my computer restarts
    it won't restart on its own afterwards....whether during the game or after I finish playing.....
     
  24. winglet

    winglet TS Rookie Topic Starter

    I just tried a new power supply and it still just randomly restarts...

    :(
     
  25. winglet

    winglet TS Rookie Topic Starter

    the restart varies, it is completely random, sometimes 5 minutes, sometimes hours....
     
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