I a having the same problem. Sometimes the laptop starts and works fine however sometimes it doesn't and reflects three blinks in the Power led (One which looks like lightening bolt). I tried hard reset and even resetting the RAm but no help. Today morning it started and asked whether to start the windows normally. On clicking yes it went off.
I am not sure what can be the problem and how much cost to restorte it. Further since it is 4 years old i can't decide whether to sell or repair. I don't have much use may be weekly for 1 - 2 hours. Also i have my Media stored in it.