problem at startup

Nir i

Honorable
Mar 29, 2013
20
0
10,510
I actully don't know if i'm writing this question in the right section
but i have a problem at startup with my computer, everytime i turn on the computer
it's start running everything is wroking but the screen\display is not getting an image in stays in sleep mode.
i turn on & off the computer a few times and then it lights up and i can start wroking
i tried switching the cable of the screen that goes to the computer and it stays the same also i tried to connect the computer to anoter screen but the same result
I don't know what to do to solve this problem

can anyone help me figure this thing out???