shutting down and camera problem

[s123]

I got some problem after updating my Xperia L from 4.1.2 to 4.2.2. My phone's camera does not give the better performence like before and often the phone takes shutdown when i want to unlock my phone. But now i can't swiched on my phone and there is no notification light and display apear  when i am charging the phone. Please Please help

[Sam]

Do you get any response from the phone at all when you try to power it on such as a light or vibration?

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