Technical information

Symptom Charts / Miscellaneous -
23
Troubleshooting
PowerBook (FireWire)
Intermittent
operating problems
such as not starting
up or initialization
errors
1. Remove the microprocessor EMI shield and check that the two
screws over the microprocessor unit and the screw on the left
side of the heat exchanger are installed.
2. Verify microprocessor board is properly installed.
3. Press on microprocessor board a second time to make sure the
board is fully seated.
Important: The microprocessor board can be partially inserted and
the computer will still function. However, over time, heat will
cause a partially seated microprocessor board to lose contact and
cause intermittent system problems. The connection of these
boards is checked and double-checked at the factory.
4. Remove the heat exchanger and examine the black thermal
transfer material over the microprocessor chip. Follow the
procedures in the Take Apart chapter of this manual to replace
the heat exchanger.