If the backup battery is bad it cannot save the bios info so it fails
the checksum each time you cycle the power. Replace the battery and it
should be fine. This is the coin cell battery on the motherboard, if
it's a laptop it could also be a small battery pack.
no video driver present since a reformat and can't seem to download, motherboard is a k8m400 for an...
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no video driver present since a reformat and can't seem to download, motherboard is a k8m400 for an acer desktop