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Symptom/Error FRU/Action
Mouse and Pointing Stick
problems.
1. See “1080 Keyboard
Unit” on page 54
before replacing any
FRUs.
2. Disable Trackpoint and
test Mouse again. The
Trackpoint can
interfere with the
operation of some
Mouse devices.
3. Mouse
4. Keyboard Control Card
5. Keyboard
Cursor floats or moves
erratically.
1. See “TrackPoint II
Checkout” on
page 476 before
replacing any FRUs.
2. Mouse
3. Keyboard
External display problems. 1. See “External Display
Self-Test” on
page 470 before
replacing any FRUs.
2. External Display
3. Video Card
4. System Board
Incorrect memory size
during POST.
1. See “Memory
Checkout” on
page 70 before
replacing any FRUs.
2. Base Memory Card
3. IC DRAM Card
System hang or Intermittent
hang.
1. See “Undetermined
Problem” on page 93
before replacing any
FRUs.
2. System Board
3. Hard Disk Drive
4. Replace the last device
being tested
5. Voltage Converter
The system goes into
suspend mode after the
POST.
1. System Board
2. Voltage Converter
3. Keyboard Control Card
The system does not
suspend or resume.
1. Check the
Suspend/Resume
switch operation. If
broken, replace the
Voltage Converter.
2. System Board
3. Voltage Converter
4. Keyboard Control Card
5. Keyboard
The computer does not
power-off.
1. Voltage Converter
2. System Board
ThinkPad 700, 700C, 720, 720C (9552) 91