Colour display issues

I have been using my notebook (Lenovo Ideapad Y550) with Windows 7 32-bit for months,
and yesterday when I was using it,
the colour displayed on the screen suddenly turned very pale. (Not sure if I had pressed any button accidentally)
I tried adjusting the brightless but the light of screen turned duller while the colour remained very strange.
Then I adjusted the colour settings in the control panel and it turned out fine.
However when I restart the computer,
the colour displayed became very pale again after logging in for about ten seconds.
Thus now every time when I start the computer I had to colour settings in the control panel.
I have just installed the latest update on displayer driver (NVIDIA GeForce GT 130M 258.96),
but the problem remains unsolved.
What shall I do?
Thank you very much for your reply.

It might be the physical plug into the motherboard. Disassemble -> Check plugs.

^*I have been using my notebook (Lenovo Ideapad Y550) with Windows 7 32-bit for months,
and yesterday when I was using it,
the color displayed on the screen suddenly turned very pale. (Not sure if I had pressed any button accidentally)
I tried adjusting the brightless but the light of screen turned duller while the color remained very strange.
Then I adjusted the color settings in the control panel and it turned out fine.
However when I restart the computer,
the color displayed became very pale again after logging in for about ten seconds.
Thus now every time when I start the computer I had to color settings in the control panel.
I have just installed the latest update on displayer driver (NVIDIA GeForce GT 130M 258.96),
but the problem remains unsolved.
What shall I do?
Thank you very much for your reply.