The screen is blinking when start up.

I have bought the Dell Inspiron 15 5000 and it has the problem since I bought it. When it is starting up, it will flick for few times before starting up and sometimes it flicks after the logo come out. I don't know this is normal but not but the laptop is also very slow to respond after it has started up before I have installed any software on it. Is anyone facing the same problem as me?

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