Hy. If anyone ever deals with this problem again, this is what happened to me. I've opened the entire laptop to vacuum clean it. After I put it back together, step by step, turn it on -- No image, but it was running (the cooling fan was working). Now, here is the trick. Only the POWER and BATTERY led indicators, were on, HDD, and WiFi weren't. After a few research, most tracks led to a misplacement of the RAM card... which was TRUE.
So, in conclusion, if you ever pull out the RAM card out of it socket, make SURE to put it back in the CORRECT place, so to push it to the end of it's soket, and then, power your laptop.
Hope it will be usefull. Cheers.