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Please try the Fn+F6 or Fn+F8 key combinations. If you look at the Function keys in the keyboard, they will have symbols on them in Blue color, the same color as the Fn key. Find the symbol that resembles a touchpad like a mouse/box with finger , then hold down the Fn key and press that Function key, ie, F6 or F7 or F8. This will enable/disable the touchpad.
Check to see if you have the machine switched out to a stand alone monitor. This is a feature on many lap tops that lets you re-direct the signal out to a larger monitor, or if your monitor fails you can display the computer info on another screen. This feature is engaged by holding down the Fn key and tapping teither the F4, or F6 key on many lap tops. This feature can be toggled by both displaying at the same time or switched to the stand alone or the Lap top.
The other cause is that the machine has malfunctioned usually because of the CPU failure and there is nothing to boot the machine up.
Solution#1: Accidentally pressing Sft+Numlock key combination will activate & inactivates ten key pad. (You'll see light enabled in padlock symbol with a number in it [i.e.beside ALL CAPS symbol on your lap monitor]).
Use: "ShiftKey+NumLock" (NumbLock Key: 2nd panel from Top right on keyboard)