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If the problem still remains after replacement of the FRUs,
go to “Undetermined Problems” on page 290.
FRU Code FRU
50 1. Reseat the Diskette Drive (FDD-1)
2. Diskette Drive (FDD-1)
51 1. Reseat the Diskette Drive (FDD-2)
2. Diskette Drive (FDD-2)
60 1. Reseat the Hard Disk Drive
2. Hard Disk Drive
72 PCMCIA Slot Assembly
Beep Symptoms
Symptom / Error FRU / Action in Sequence
Continuous beeps. System Board
One beep and a blank,
unreadable, or flashing
LCD.
1. Reseat the LCD
connector.
2. LCD Assembly
3. System Board
One beep, and the message
“Unable to access boot
source.”
1. Boot device
2. System Board
One long, two short beeps
and a blank or unreadable
LCD.
1. System Board
2. LCD Assembly
One long beep followed by
four short beeps each time
the power switch is
operated.
(System cannot power-on
due to low battery voltage.)
Connect the AC Adapter
or install a fully charged
battery.
One beep every second.
(System is shutting down
due to low battery voltage.)
Connect the AC Adapter
or install a fully charged
battery (allows system to
complete shutdown
before changing the
battery).
Two short beeps with error
codes.
POST error. See
“Numeric Error Codes” on
page 279.
Two short beeps with blank
screen.
System Board
ThinkPad 560 (2640) 285