I haven?t had any problems with my Vaio for two years until last week when it failed to start. The power light lit up briefly and then nothing; no lights, noise, or anything. I took the screws out and tried the power again and it started. The unit was turned on and off several times that day with no problems. When the next morning rolled around, the unit failed to start again. Since I already had the screws out, I took off the keyboard and top cover and looked for any loose connectors. After about five minutes of fiddling, the unit started. The following day, I had a similar experience, as with the day after that. The only pattern I have found is that the unit won?t start when it is cold and that some amount of random fiddling temporarily fixes it. Tomorrow I will simply warm the machine in my hands, without fiddling. Maybe it is just a temperature thing.