AMD Setup Guide
Page 53
... - CMOS checksum error - CPU fan has failed. Possible hard-disk drive failure during HDD boot test. Replace the battery (see the Service Manual at checkpoint [nnnn]. Contact Dell (see the Service Manual at support.dell. To replace the keyboard, see "Contacting Dell" on page 73). Hard-disk drive read failure - Keyboard failure or loose cable. CPU...
... - CMOS checksum error - CPU fan has failed. Possible hard-disk drive failure during HDD boot test. Replace the battery (see the Service Manual at checkpoint [nnnn]. Contact Dell (see the Service Manual at support.dell. To replace the keyboard, see "Contacting Dell" on page 73). Hard-disk drive read failure - Keyboard failure or loose cable. CPU...