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Beep and No beep symptoms - ThinkPad R500

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
One beep and a blank, unreadable, or flashing LCD.
  1. Reseat the LCD connector.
  2. LCD assembly.
  3. External CRT.
  4. System board.
One long and two short beeps, and a blank or unreadable LCD.
  1. System board.
  2. LCD assembly.
  3. DIMM.
Two short beeps with error codes.Click here to diagnose the error code
Two short beeps and a blank screen.
  1. System board.
  2. DIMM.
Three short beeps, pause, three more short beeps, and one short beep.
  1. DIMM.
  2. System board
One short beep, pause, three short beeps, pause, three more short beeps, and one short beep.
Only the cursor appears.Reinstall the operating system.
Four cycles of four short beeps and a blank screen.System board (security chip)
Five short beeps and a blank screen.System board
No beep symptoms
Symptom or errorFRU or action, in sequence
Device address conflict.
  1. Load “Setup Defaults” in the BIOS Setup Utility.
  2. Backup battery.
  3. System board.
Allocation error for device.
  1. Load “Setup Defaults” in the BIOS Setup Utility.
  2. Backup battery.
  3. System board.
Failing bits: nnnn.
  1. DIMM.
  2. System board.
Invalid system configuration data.
  1. DIMM.
  2. System board.
I/O device IRQ conflict.
  1. Load “Setup Defaults” in the BIOS Setup Utility.
  2. Backup battery.
  3. System board.
Hibernation error.
  1. Restore the system configuration to what it was before the computer entered hibernation mode.
  2. If memory size has been changed, re-create the hibernation file.
Fan error.
  1. Fan.
  2. Thermal grease.
  3. System board.
Thermal sensing error.System board.
Cannot boot from any device.

Check the status of device which you want to boot from.

Device not found.

  1. The device you want to boot from.
  2. System board.

Device Error.

  1. The device you want to boot from.
  2. System board.

No valid operating system.

  1. Check that the operating system has no failure and is installed correctly.
  2. Reinstall the operation system.

Excluded from boot order.

  • Enter the BIOS Setup Utility and add the device in boot order.

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 disk password prompt appears.

A hard-disk 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.


  • Alias ID: MIGR-73954
  • Document ID: HT005068
  • Last Updated :17-06-2014
  • (c) 2014 Lenovo