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Beep and No beep symptoms - ThinkPad L410, L412, L510, L512, SL410, SL510

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.

Beep Symptoms
Symptom or errorFRU or action, in sequence
Bad CRC2. Enter BIOS Setup Utility, and load Setup defaults. (two short beeps)

Press F1 to enter BIOS Setup Utility. Press F9, and Enter to load the default setting. Then save the current setting by pressing F10, and restart the computer.

Fan error. (four short beeps, one long beep)
  1. Fan.
  2. Thermal grease.
  3. System board.
DRAM is unplugged. (four short beeps, pause, three short beeps, pause, one short beep, pause, one short beep)

Install the DRAM.

DRAM is not well plugged. (seven short beeps, one long beep, four short beeps, one long beep, one short beep, one long beep, one short beep, one long beep till forever.)

Reinstall the DRAM.

Operating system not found.
  1. Check that the operating system has no failure and is installed correctly.
  2. Enter BIOS Setup Utility and see whether the hard disk drive is properly identified. If you still see the same error message, check the boot sequence.
  3. Reinstall the hard disk drive.
  4. Reinstall the operating system.
Unauthorized WAN card is plugged in Power off and remove the WAN card.

Turn off the computer and remove the WAN card.

System Configuration Data Read Error (two short beeps)

Press F1 to enter BIOS Setup Utility. Press F9, and Enter to load the default setting. Then save the current setting by pressing F10, and restart the computer.

No beep symptoms
Symptom or errorFRU or action, in sequence
No beep, power-on indicator on, LCD blank, and no POST.
  1. Make sure that every connector is connected tightly and correctly.
  2. DIMM.
  3. System board.
No beep, power-on indicator on, and LCD blank during POST.
  1. Reseat DIMM.
  2. System board.
The power-on password prompt appears.

A power-on password or a supervisor password is set. Type the password and press Enter.

The hard drive password prompt appears.

A hard drive password is set. Type the password and press Enter.

No beep, power-on indicator on, and a blank LCD during POST.

System board.

  • LCD backlight not working.
  • LCD too dark.
  • LCD brightness cannot be adjusted.
  • LCD contrast cannot be adjusted.
  1. Reseat the LCD connectors.
  2. LCD assembly.
  3. System board.
  • LCD screen unreadable.
  • Characters missing pixels.
  • Screen abnormal.
  • Wrong color displayed.
  1. See important note for "LCD-related symptoms."*
  2. Reseat all LCD connectors.
  3. LCD assembly.
  4. System board.
Horizontal or vertical lines displayed on LCD.

LCD assembly.

*: The TFT LCD for the notebook computer contains many thin-film transistors (TFTs). The presence of a small number of dots that are missing, discolored, or always lighted is characteristic of TFT LCD technology, but excessive pixel problems can cause viewing concerns.