MacBook a1278 doesen't work

Hello everyone, my macbook A1278 2008, all of a sudden it on and off while I was using it and does not and more turned on them. I noticed that the cooling fan does not rotate, but the battery is recharged, the start charging connector and green then turns orange. I tried all combinations of buttons to turn on the handset but nothing. what do you advise me? and it is possible that the video card? but he has never given artifacts, or the charging connector on the motherboard? how can I figure out what you and broken? thank you guys