This problem has occurred here and 2 weeks or so. It does not happen everyday but lately it happens almost everyday and I'm so worried. (I'm not much of a computer expert so I don't know what it could be) Also I bought the computer from a retailer and sadly the warranty is expired. When I press the button to turn on my computer, while it is about to boot it shuts down immediately. The lights blink normally and when it shuts down they close also. There is no beeps or anything and neither the screen turns on. This might happen for 1, 2 or even 3 times. Later it boots normally and it doesn't give me any safe mode error in case I had an unexpected shutdown. It boots normally. I have noticed that the problem usually occurs if I leave my computer inactive for many hours and I turn it on later. I also let it to rest for a day and nothing.I'm worried though, it's my only laptop and I'm trying to figure out what it could be.I have never opened my computer to clean it, I don't know how to do it in case that there is dust in some device.All I was ever using on my computer was a small fan to cool the system. I also changed the power adapter and it still happens. What do you think?