|sounds like it has overheated, this is preventing it from turning on. It may be that a lot of dust has gathered inside the unit and the ventilation is poor. |
Ideally it could do with a service my disassembling the unit and cleaning it inside. Or if you are not that computer minded, then try cleaning the fan/vent section of the laptop with a vaccum or/and compressed air duster spray and see if it is any better.
Hope this helps.