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Sounds like the CMOS battery is going....
The Signs of a Bad CMOS Battery | eHow.comA constant beeping sound is another sign that your CMOS battery is dying. The final sign that your CMOS battery is going dead is that you'll receive an error message. The three main types of error messages are: CMOS Checksum Error, CMOS Read Error and CMOS Battery Failure. If you do receive this error, you can just leave the computer on for 24 hours to see if that recharges the battery. If you are still having trouble after this timeframe, you should change the CMOS battery.
And in case you do need to replace the battery:
Replacing The CMOS Battery in Laptops | eHow.com