toshiba a300 powers off randomly
I have A300 toshiba satellite, i used it for almost two years now.but few days ago It starts to powers off randomly each time it tried to load operating system, I replaced the hard disk with the new one but it doesn't fix the problem. Then i took it apart and clean the fan and mother board but still it behave the same.
am wondering what could be the source of the problem ? If there's any one who knows the solution, please help cause am stuck and i don't know what else to do!