Hello my friends. I am from Greece and I would like to apologize for my bad english.i would like to describe the issue about my acer v15 laptop.each time I press the power button then it is appearing for few seconds the logo of acer then some letters in a black screen like something is reading then a blinking symbol of _ and then shut down.After 15 tries the laptop opens and working without issues.any idea.THANK FOR AN ADVANTAGE.