So, I was trying to figure out why these two coils keep on knocking, when I decided to let go of a couple of balls onto the playfield. It was a little lifted.
I did by opening that little part, there.
IMG_20181007_220334228 (resized).jpg
And that's when the playfield lit off. And now, it just won't boot.
I can hear the screen turn on, but nothing on it.

I couldn't find any fuse on this machine.
I'll download the tech doc right away, but if any of you had any lead for me to know where to start...

Also, I just couldn't find where to plug this one...
IMG_20181007_220432248 (resized).jpg

Yes, it is.
I didn't say it, but it was booting correctly when the issue appeared.
Now it starts, the light and the fans are on, but nothing more...

Hmm...
I've checked everything, but nothing...
My friend knows an operator who's got two of them. He might take the computer tontedt it over there...

Well, in the end, my friend took out the computer and put some thermal paste next to a fan (?).
It seems there was not anymore...
So the thing's booting again.
Thanks for your help !