My S-5 screen went into Black & White.

I m Using Samsung S-5. Now the problem is that I usually Charge my Phone in "Ultra Power Saving Mode" Status. Now since 3 days the screen is not responding properly. Its in Black & White Color. Cant see Color in my phone. What to do to restore back in its original position? I haven't reset my phone on factory reset setting. Should i or there is any other method?

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