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Screen flashes frequently after some time

Hello Sir,

I have one Dell Inspiron 15 5458 series laptop. Its screen flashes many times automatically. By flashing I mean that its brightness increases immediately or decreases to zero suddenly only for a moment. I have googled for it and disabled 2 services from msconfig. But still, that problem continues. Also, sometimes when I try to decrease the brightness of the screen using the function key provided, laptop suddenly goes in sleep mode.

Please Help me with this.

Thank you.

Chaitanya Mehta

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