When i start Lenovo thinkpad T400, i get to see a lock symbol with blank screen

Hi sundar1968,


I see that your Thinkpad T400 machine is locked and you are unable to make use of the machine.

to be able to unlock the machine power the system on once turned ON you will see a Lock icon on the center of the screen just press and hold down the FN key for at least 5-7 seconds or if possible untill the lock icons shows that it is unlocked.

This should help you with your concern.

Have a nice day,

mvincentc