Dell Inspiron 15 (N5010, Early 2010) - Manual (Page 57)

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Using Support Tools
System Messages
If your computer has an issue or error, it may display
a System Message that will help you identify the
cause and action needed to resolve the issue.
NOTE: If the message you received is not
listed in the following examples, see the
documentation for either the operating
system or the program that was running
when the message appeared. Alternatively
you could see the Dell Technology Guide on
your hard drive or at support.dell.com or see
“Contacting Dell” on page 76 for assistance.
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 76).
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 76).
CPU fan failure — CPU fan has failed. Replace
the CPU fan (see the Service Manual at
support.dell.com).