இவற்றுள் ஏதாவதாக இருக்கலாம். Keyboard is locked , Incompatible keyboard driver ,Virus infected
try
-clean keyboard
-turn back and retest the keyboard .
-hold down FN button then press scroll
-Fn + Numlock Shut down the computer
-Unplug the power cord
Take the battery out for a few minutes
Replace the battery and start the computer