Chosen Solution
Went a turn on my mac pro ,the screen stay black but the fan are turning, i hear them well and the little led in front on the right side open. Thank s
Do you have access to an external monitor? If you do see if you get an image on it.
Try zapping the PRAM. On start up hold down the following keys P R Command Option. Let it bong twice and see if the screen comes up.
I have done PRAM 3 times and it does not help please. Is there any clue?
