T r o u b l e s h o o t i n g
MS660 OWNER’S HANDBOOK 7/3
Number of beeps
Meaning
No beeps
If no beeps are heard at all the speaker may be
disconnected or there may be a speaker circuitry
fault.
One short beep
Marks the completion of POST and no
functional errors found. You will also get a single
beep if you press an invalid key for a power-on
password.
Two short beeps
Indicates and draws your attention to an error
during POST. This should be accompanied by
an error message.
Three short beeps
.
System memory error, normally accompanied by
BIOS error code 201. Beeps are used when the
video cannot display the code.
Continuous beep
Could indicate a serious failure of the system
motherboard, or a failure of the speaker circuitry.
Repeating short
beeps
Usually indicative of a keyboard key stuck down,
but may be due to the keyboard interface failing.
One long and one
short beep
POST has detected an error on the video adapter
in the system. There may be no display on the
screen.
One long and two
short beeps
This means that either the video system is faulty,
or that a video I/O adapter ROM is not readable.
Two long and two
short beeps
The video subsystem cannot be supported by the
main system POST. This can occur when the
video subsystem is replaced or changed on site.
Many of these following codes indicate a more serious fault and the
BIOS stops. Switch off for 20-30 seconds and try again. If the fault
persists, make a note of it and call your maintenance provider.
Number of beeps
Meaning
1-1-3
CMOS write/read test failure
1-1-4
BIOS ROM checksum failure
1-2-1
Programmable Interval Timer test failure
1-2-2
DMA initialisation failure
1-2-3
DMA page register read/write test failure
1-2-4
RAM refresh verification failure
1-3-1
First 64K RAM test failure
1-3-2
First 64K RAM parity test failure
