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No-beep symptoms
Table 4. No-beep symptoms
Symptom or error
No beep, power-on indicator on, LCD blank, and no
POST.
No beep, power-on indicator on, and LCD blank during
POST.
The power-on password prompt appears.
No beep, power-on indicator on, LCD blank, and LED
indicators on Esc, F1 and F4 blink sequentially during
POST.
No beep, power-on indicator on, LCD blank, and LED
indicators on Esc, F1 and F4 blink during POST.
The NVMe password prompt appears.
LCD-related symptoms
Important: 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.If the LCD you are servicing has
two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more
visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.
Notes:
• This policy applies to all ThinkPad notebooks purchased on 1 January, 2008 or later.
FRU or action, in sequence
1. Run LCD Self Test.
2. Ensure that every connector is connected tightly and
correctly.
3. Reseat memory module.
4. Replace the system board.
1. Run LCD Self Test.
2. Reseat memory module.
3. Replace the system board.
A power-on password or a supervisor password is set.
Type the password and press Enter.
UEFI BIOS is performing memory retraining. The memory
retraining might occur if any of the following situations is
detected:
• Memory module replacement
• Total Memory Encryption setting change in UEFI BIOS
• Memory Reference Code [MRC] change when UEFI
BIOS updates
Do not press the power button to interrupt this process.
Wait a few minutes until the logo screen is displayed.
UEFI BIOS is self-recovering. If the UEFI BIOS is
corrupted or maliciously attacked, it can self-recover and
restore computer from the last uncorrupted and secure
backup.
The blinking LED indicators on keys indicate the self-
recovery progress:
• LED indicator on Esc blinks: 0% to 32%
• LED indicators on Esc and F1 blink simultaneously:
33% to 65%
• LED indicators on Esc, F1 and F4 blink simultaneously:
66% to 100%
Do not press the power button to interrupt this progress.
Wait a few minutes until the logo screen is displayed.
An NVMe password is set. Type the password and press
Enter.
Chapter 4
.
Related service information
37
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