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No Beep Symptoms
Symptom/Error FRU/Action in Sequence
No beep, power-
on indicator on,
and a blank LCD
during POST
1. Ensure all connectors are securely
seated.
2. Reseat the CPU
3. CPU
4. System board
No beep, power-
on indicator not
on, and a blank
LCD during
POST
1. Reseat the LCD Connectors
2. Power source (battery & adapter).
See “Power System Checkout” on
page 8.
3. Audio connector board
4. Charger board
5. Hard disk drive
6. LCD inverter ID
7. LCD FPC Cable
8. LCD inverter
9. LCD
10. System board
No beep, power-
on indicator on,
and a blank LCD
during POST.
1. Reseat the DIMM.
2. Reseat the LCD Connectors.
3. Hard disk/CD-ROM/diskette drive
connectors
4. Hard disk drive
5. Keyboard
6. LCD inverter ID
7. LCD FPC Cable
8. LCD inverter
9. LCD
10. System board
No beep, power-
on indicator on,
and a blinking
cursor only
during POST.
1. Reseat the LCD Connectors
2. Reseat Hard disk/CD-ROM/
diskette drive connectors
3. Hard disk drive
4. LCD inverter ID
5. LCD FPC Cable
6. LCD inverter
7. LCD
8. System board
No beep during
POST but
system runs
correctly.
System board
Note: The buzzer is on the system
board.
LCD-Related Symptoms
Important: The notebook computer LCD contains over
921,000 thin-film transistors (TFTs). A small number of
missing, discolored, or lighted dots (on all the time) is
characteristic of TFT LCD technology, but excessive pixel
problems can cause viewing concerns. The LCD should
be replaced if the number of missing, discolored, or lighted
dots in any background is 21 or more.
18 IBM Mobile Systems ThinkPad 310 (D/E/ED) HMM