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When the power is turned on, the computer returns from hibernation mode and resumes operation. The
hibernation le in the boot record on the hard disk drive is read, and system status is restored from the
hard disk drive.
Wireless off mode
In wireless off mode, the wireless features are turned off to conserve power. To turn off or turn on the
wireless features, press F8.
Symptom-to-FRU index
This section contains following information:
• “Numeric error codes” on page 36
• “Error messages” on page 38
• “No-beep symptoms” on page 38
• “LCD-related symptoms” on page 39
• “Intermittent problems” on page 39
• “Undetermined problems” on page 39
The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most
likely cause is listed rst, in boldface type.
Note: Do the FRU replacement or other actions in the sequence shown in the column headed “FRU or
action, in sequence.” If replacing a FRU does not solve the problem, put the original part back in the
computer. Do not replace a nondefective FRU.
This index can also help you determine, during regular servicing, what FRUs are likely to need to be
replaced next.
A numeric error is displayed for each error detected in POST or system operation. In the displays, n can
be any number.
If no numeric code is displayed, check the narrative descriptions of symptoms. If the symptom is not
described there, go to “Intermittent problems” on page 39
.
Note: For a device not supported by diagnostic codes in the ThinkPad notebook computers, see the
manual for that device.
Numeric error codes
Table 2. Numeric error codes
Symptom or error
FRU or action, in sequence
0177
Bad SVP data, stop POST task—The checksum of the
supervisor password in the EEPROM is not correct.
System board.
0183
Bad CRC of Security Settings in EFI Variable. Enter the
ThinkPad Setup program.
1. Run the ThinkPad Setup program, and then save
current setting by pressing F10.
2. System board.
0187
EAIA data access error—The access to EEPROM is failed.
System board.
0188
Invalid RFID Serialization Information Area.
System board.
36 Hardware Maintenance Manual