My notebook at times will fail to fully boot up,when I turn it on or try to wake it up after brief break you can hear it whirl into action for a couple of seconds and then nothing. The screen stays dark though there is power to it,the lights at the base of the screen light up,I.E. they lights the speaker,wireless connection are on but they are orange.
The problem occurs every few days,I've taken it into a repair facility a couple of times when it was acting up and when they put it on the bench to look at it,it fired right up. Usually it will take a couple of days of cycling the power dozens of times for it to come back.
RCD99