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Alert! Previous attempts at booting this system
have failed at checkpoint [nnnn]. For help
in resolving this problem, please note this
checkpoint and contact Dell Technical
Support — The computer failed to complete
the boot routine three consecutive times for the
same error. Contact Dell (see “Contacting Dell”
on page 74).
CMOS checksum error — Possible
system board failure or RTC battery low.
Replace the battery (see the Service Manual
at support.dell.com/manuals) or Contact Dell
(see “Contacting Dell” on page 74).
CPU fan failure — CPU fan has failed. Replace
the CPU fan (see the Service Manual at
support.dell.com).
Hard-disk drive failure — Possible hard‑disk
drive failure during POST. Contact Dell (see
“Contacting Dell” on page 74).
Hard-disk drive read failure — Possible
hard‑disk drive failure during HDD boot test.
Contact Dell (see “Contacting Dell” on page 74).
Keyboard failure — Keyboard failure or
loose cable.
To replace the keyboard, see the Service
Manual at support.dell.com/manuals.