Why wont my MacBook boot up?

Recently, I was working with my MacBook Pro as I always do. At night, before I go to bed, I closed my MacBook which puts the engine into sleep mode. When I got up in the morning to open my laptop, I noticed that my MacBook is not turning on. I took my laptop to local technicians (because there is not an official apple repair store here) , they said that the problem is from the main board and that the problem is likely from the CPU. Unfortunately, the incident has happened one month passed my warranty. I am a hardworking student with limited budget. I took great care of my MacBook Pro and I believe that the laptop has been faulty for the incident.

any idea friends?!

is it possible that the problem cause because of anything else?