Notebook Software and How To Questions

I have issues with Notebook keyboard. All keys work - No issues with keyboard functionality. But, I do have different kind of issue with keyboard.

Issue I have with keyboard is:

• Home, End, Page Up, Page Down keys are present with Number pad. There are no dedicated keys for them. Key 9 is for PgUp, Key 3 is PgDn. Simiarly for Home and End. These keys works and the corresponding functionalities work when Number Lock is disabled. In Browser and IDEs, Page Down and Page Up functionalities work without any issues, when pressing 3 and 9 respectively when number lock is disabled.
• But on Certain games like NFS Rivals, We need to press Page Up to start an event or to enter into garage. When pressing the PgUp Key, the Game don't recognize. On connecting external keyboard and pressing the dedicated key, it did work in the game. But, the Keys in the Number pad didn't work. So, technically speaking it is completely impossbile to play any game which requires dedicated Page Up, Page Down, Home, End key. 

Can anyone from the community help us to fix if there is any such options. I have tried following

• Inbuilt Keyboard: Number Lock Disabled : Pressed 9 (Page Up) = Game didn't recognize the Page Up
• Inbuilt Keyboard: Number Lock Disabled : Fn key + Pressed 9 (Page Up) = Game didn't recognize the Page Up
• Inbuilt Keyboard: Number Lock Enabled : Pressed 9 (Page Up) = Game didn't recognize the Page Up
• Inbuilt Keyboard: Number Lock Enabled : Fn key + Pressed 9 (Page Up) = Game didn't recognize the Page Up
• External : Dedicated Page Up key = Recognized