RE: Mi computadora encendía, pero a los pocos minutos se apagaba // My computer would turn on, but after a few minutes it would shut down
I used to do this a lot when I was in to home PC repair, especially in smoker's homes. If you have a vacuum with a duster attachment, they work great for cleaning these out quickly, often without even removing the heat sink and fan.
RE: Mi computadora encendía, pero a los pocos minutos se apagaba // My computer would turn on, but after a few minutes it would shut down