Acer Aspire Z5771, Service Manual

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Troubleshooting
4-5
Beep Codes
0
Beep codes are used by the BIOS to indicate a serious or fatal error to the end user. Beep
codes are used when an error occurs before the system video has been initialized. Beep
codes will be generated by the system board speaker, commonly referred to as the PC
speaker.
AMIBIOS displays the checkpoints in the bottom right corner of the screen during POST. This
display method is limited, since it only displays checkpoints that occur after the video card has
been activated.
Not all computers using AMIBIOS enable this feature. In most cases, a checkpoint card is the
best tool for viewing AMIBIOS checkpoints.
Table 4-1.
System ready
Symptom:
One short beep. Description:
System is OK.
Memory not installed or memory error
Symptom:
Continuous one long beep. Description:
Something is wrong with the memory installed.
Note that there could also be something wrong with
just accessing the memory (ie the motherboard has
a problem).
VGA not installed or VGA error
Symptom:
One long beep, then two short beeps
and repeat. Description:
The motherboard is not able to access the video
card for some reasons. Either the video card is not
working, its memory is not accessible, or its BIOS
may be corrupt. This error code could also mean
something is wrong with the motherboard.
BIOS damaged
Symptom:
One long beep, then one short beep. Description:
BIOS damaged. Processor jump to BootBlock to
execute the default procedure.
CMOS damaged
Symptom:
Two short beeps. Description:
CMOS checksum error.