Default Just a simple question :)

Everytime i power on my z1 it flicks..
Is this normal or something is broken?

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Sony. Xperia Tablet Z - SGP311. No Root. Build 10.1.C.0.370. Stock.
Sony Ericsson. Xperia Arc S - LT18i. Rooted. Firmware 4.1.B.0.587. Xperia S-GX-T Style.
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