Computer Problems

Today I got home from house sitting my inlaws's house. I was relieved to get home because I just couldn't wait to come home. I got here at 7pm. Well I felt like getting on the computer and guess what. It doesn't turn on at all. I opened up the tower to see if dust was blocking anything but it wasn't. I still need to buy a can of compressed air because it's really dusty in there. It's probably been a month since I haven't cleaned the tower from the inside so it's been building up. Anyway I checked that nothing was lose inside and still nothing. I used a different outlet and nothing. I noticed that the tower is getting electricity from the surge protector because when I disconnected the surge protector from the outlet the light was still on so I disconnected the computer from there and the light from the surge protector turned off. So I figure there might some burnt fuse or something. I don't know what I'm going to do. I'm kinda pissed and sad. The good thing is that I have an external hard drive that I saved everything to.