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Symptom / Error FRU / Action in Sequence
Memory count (size)
appears different from
actual size.
Go to “Memory Checkout”
on page 416.
System configuration does
not match the installed
devices.
Go to “Checking the
Installed Devices List” on
page 450.
System hangs intermittently. Go to “Intermittent
Problems” on page 447.
DSP-Related Symptoms
Symptom / Error FRU / Action in Sequence
In OS/2, DOS, or Windows
multimedia programs, no
sound comes from the
computer. (Only system
beeps heard at power-on.)
1. Reseat the DSP card.
2. Go to “1170 DSP
Card or ESS Card” on
page 480 and check
the DSP card.
3. Check that the device
driver is installed
correctly.
In OS/2, DOS, or Windows,
the modem does not work.
1. Check that the DSP
Modem is active.
OS/2 and Windows:
Click the DSP Modem
icon in the ThinkPad
Configuration program.
DOS:
Run the MWMODEM
ON command.
2. Reseat the DAA
module.
ESS-Related Symptoms
Symptom / Error FRU / Action in Sequence
In OS/2, DOS, or Windows
multimedia programs, no
sound comes from the
computer. (Only system
beeps are heard at
power-on.)
1. Reseat the audio
(ESS) card.
2. Go to “Audio (ESS)
Card Checkout (765L)”
on page 419 and
check the ESS card.
3. Check that the device
driver is installed
correctly.
Peripheral-Device-Related Symptoms
Symptom / Error FRU / Action in Sequence
External display does not
work correctly.
See “External Display
Self-Test” on page 682.
Printer problems. 1. Run printer self-test.
2. Parallel port device
3. Cable
4. System board
444 IBM Mobile Systems HMM