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This is a common problem for A20's. It's a bad EEPROM or a bad M/B. IBMs resolution is to replace the board. please see link.
Also found this link with some tests you can do to find out if it's the board or the EEPROM. Either way it's not a simple fix. Please click here.
There is an offer for repairing the EEPROM in this link. Posting
the link is purely for informational purposes. Please do not consider
it an endorsement of any kind.