I've searched for a little while and couldn't find the exact problem, but I'm sure it's common though I've encountered 3 times and not sure how to pin point the exact issue.
Laptop takes 0minutes to hours to boot, it hang on black screen without any errors at all, you might wait few mins or hours and all of the sudden it lights up without a problem and works normal. When I power it on the fan turns on and dvd drive makes some noise, then it quiets down and fan with light is the only thing thats on, also caps and numlock lights blinking without a stop.
I heard it could be bios, battery, charger but I can't afford buying a new charger then new battry etc everytime this happens, atm i can't afford anything lol.