I have a Satellite P755D and it constantly shutting down, it could start from two to five minutes and its shuts off and it will not power on again. I have read in some forums that it could be defective start button but Toshiba will not admit it I don’t think is overheating since is cold when you start it and it shuts down in a couple of minutes or it will not power up at all. This laptop is practically brand new since I could never use it. I would appreciate if somebody has an idea on how to repair this nice looking paper weight since Toshiba has been NO help and of course the warranty ran out.