The logic board of my computer didn't work. When the computer was cold after several hours not using it, it was difficult to start again. I had to warm-up putting the computer over the heater to be able to restart it again!
Following the instructions I was able to change the logic board on my own. It was easy following the pictures featured on the web.
What about the replaced logic board. Are you interested on getting it back for future repairs? Otherwise I will waste it.