On most IBM laptops, in order to turn numlock on/off, you must press Shift + Scroll Lock. You can tell if numlock is on at-a-glance because a symbol that looks like an arrow pointing up with a "1" in its center is illuminated on the status light display located near the power button.
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Problem is related to your thinkpad screen,your thinkpad screen is dead,this problem arises due to manufacturer defect.so you have to replace screen or plasma to work normally.Visit nearer service centre.