External initial release

My laptop is having an issue where it boots up and then it freezes for about 2-4 minutes before you can actually use it. What I mean is when I turn the system on, it goes through boot sequence and passes the welcome screen.

As I began using the newly bought PC, I noticed that my screen was blinking randomly among the day as I work, sitting in front of this PC all day/everyday 8 AM - 5PM. Sometimes 3-4 times in 5 mins or sometimes no blinking for 3-4 hour.