Hello, something went wrong with my screen and the white parts just went YELLOW. How can I fix this?

Hello, I have a Macbook Pro 15' Mid 2012,
Suddenly I opened my laptop and this happened. As you can see all the WHITE Color turned into YELLOW. I've tried knowing whether this is a software or hardware issue. I think it's a software though.
Things I did after this happened:
1. Tried Calibrating the Screen
2. Tried Reinstalling the OSX

Howdy AhmedNT,
It sounds like the white sections of webpages have a yellow tint to them.
I want to recommend a few things here. First try booting to safe boot with this article:
Mac OS X: What is Safe Boot, Safe Mode?
http://support.apple.com/kb/ht1564
Safe Mode is the state into which you can start up your Mac by performing a Safe Boot. To perform a Safe Boot, press and hold the Shift key immediately after your Mac starts up. Continue holding down the Shift key until a gray Apple logo appears on the screen.
If that does not resolve the issue, try resetting your PRAM.
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information.
And I would also suggest changing your resolution to see if that helps the situation.
OS X Mountain Lion: About the Display pane of System Preferences
http://support.apple.com/kb/HT5369
Thank you for using Apple Support Communities.
Take care,
Sterling

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