my laptop screen seems have malfunctioned can anyone help??

one day i left my laptop for about 3 days turned on. after that somehow my screen turning rather yellowish. how can i switch it back to normal??

i have tried the following

1. i check nvidia panel, then change the color setting. the colors back normal but after restarting again it turned to yellowish again.

2. rollback the graphic driver to factory setting, nothing happen.

3. i re-install the nvidia driver to the latest, nothing happen

4. i calibrate the color, it switch back to normal but upon restarting it turned yellowish again

5. i change the color theme, it change color but the screen still have yellowish color. iturned it back to basic win 7 theme, nothing happen

6. i tried removing the batteries for 30 minutes hoping it is only a glitch, nothing happen