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179 posts

Master Geek


# 19534 20-Feb-2008 17:01
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Hi,

After being unplugged from mains power a subsequent restart of PC comes up with :-

Bad CMOS Checksum
Press F1 for setup
or F2 to load BIOS  defaults

Reloaded BIOS and then shutdown, unplugged and retried. Same result.
Replaced battery, and tried again. Same.
Normal shutdowns and restarts give no problem. Only happens when PC is disconnected from mains power.

No BIOS flashes or any such changes were made to the PC.
Only activity was a addition of a 300GB IDE HDD and a re-install of XP to use partition on new drive as C:

Mainboard is ASUS K8V-X.

Any ideas anyone?

Would also welcome suggestions on how to flash BIOS on this board without a floppy.
Can it be done from a bootable CD?

Thanks in advance

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# 111894 20-Feb-2008 17:03
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Was this question not asked before

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  # 111896 20-Feb-2008 17:17
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I answered it before, but it seems to have been wiped off or something.

Basically, just press F2, it usually works most of the time (unless there is a problem with the CMOS itself, and probably will result in a replacement of the motherboard).




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179 posts

Master Geek


  # 111924 20-Feb-2008 19:56
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Was originally posted in wrong forum so I moved it.

I did of course try the F2 option, however the next time that the PC was disconnected from mains the problem recurred.

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  # 111927 20-Feb-2008 20:05
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BIOS is stored in the CMOS (like the software in a HDD), so I don't think a BIOS flash would help, but give it (and anything) a try before my 2 other possibilities put you down:
  • Dead battery (very small, but sometimes new ones are already DOA Laughing)
  • Dead or dying chip (which seems to be at fault)
Try everything. Guessing by the K8V tag, I'm thinking you've got an AMD, ~3 year-ish motherboard.




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179 posts

Master Geek


  # 111945 20-Feb-2008 21:24
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Thanks for the info.

Simplest solution seems to be to keep the darned thing plugged in!  Undecided


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