MiscellaneousTroubleshooting
PowerBook (FireWire)
25
Intermittent operating problems such as no booting
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 that microprocessor board is properly installed.
3. Press on microprocessor board a second time to make
sure the board is fully seated.
Caution: 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 phase
change material over the microprocessor chip. Follow
the procedures in the Take Apart chapter of this manual
to replace the heat exchanger.
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