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ThinkPad NotebooksThinkPad T400 / T500 and newer T series Laptops Knowledge Base

T420 BIOS - "Clear Security Chip" option missing


We have several T420 with different BIOS versions (from 1.30 to 1.40). On 95% of them the "Clear Security Chip" Option is available in the BIOS but on some of them the option is missing.


The clear security chip option is only in BIOS after a cold boot.


It won't be there after a warm boot.


This is for security reasons.


To do a Warm Boot,


  • Press the CTRL + ALT + DEL keys.
  • Or hold down the SHIFT key while choosing Restart from the Start menu.

To do a Cold Boot, 

  • Press and hold the power button for a couple of seconds until the computer turns off.
  • Wait for about 15 seconds before turning it back on.


A Warm Boot is carried out when a simple error is encountered and the system cannot be shut down. A Cold Boot is done when the whole system freezes or hangs.

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