I have a 15 inch Toshiba Laptop. Was bought 4 yrs ago but only taken out of package and used 4 months ago. Hardly any data in it. so close to being new. Suddenly it switched off and went dead. No power going into the unit. No lights. nothing. Battery fully charged. No warranty now. Before I take it for repair, can anyone tell me what could be the fault. Could it be a minor fault or a major fault. I know it has to be opened and inspected. Maybe someone went through this and could explain what was replaced. Thanks. Bill.