Need help on this laptop.When I push power button it flashes power lights after the third or forth try it turns on but the screen may stay off then push again and the screen turns on but after going into windows it shut off. I have dont all the basic test from power cord, battery, memory, hard drive, ect. The power cord is the right one & has power coming out tested it.I've switched out the power button board and still wont work. I'm so frustrated about to throw it in the trash. Any help would be helpful on this.