Dell Precision 1G155 Setup And Quick Reference Manual page 49

Beep Codes
If an error occurs during start-up that cannot be reported on the monitor,
your computer may emit a beep code that identifies the problem. The beep
code is a pattern of sounds: for example, one beep, followed by a second
beep, and then a burst of three beeps (code 1-1-3) means that the computer
was unable to read the data in nonvolatile random-access memory
(NVRAM).
If a beep code is emitted, write it down and look it up under "System Beep
Codes" in the User's Guide.
NOTE: If the system
message you received is
not listed in the User's
Guide, check the
documentation for the
application program that
you were running at the
time the message
appeared and/or the
operating system
documentation for an
explanation of the
message and a
recommended action.
Setup and Quick Re ference Guide
49