I am concurrent with 420. As for the actual reason behind it, it could have been caused by a number of things. Laptops though, being as compact as they are, can really have problems with heat if they don't have very good cooling. If you recall it getting fairly hot, and you take it to get fixed, I would ask the person you go to about the cause of the problem. If it turns out to be heat maybe you should look into getting a laptop cooling pad or mat for it. I've seen some excellent ones on Newegg while I was browsing for alternative cooling methods for my 360. Many of them are also fairly inexpensive.