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    Screen of LG Optimus S goes black but all 4 buttons flash

    I have recently purchased LG Optimus S, Which is an android mobile. It worked great until today. Yesterday, I was watching videos on YouTube. Suddenly, Screen turned black. Now, I have fully charged it but the screen is still dark. However, all 4 buttons flash without any issue. Sometimes, It shows the LG sign but screen again goes dark. What should I do?

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