We need to make sure that the problem is not from something else than the computer such as faulty power cable,...
> Does another appliance work on the same plug?
> Is the switch (power supply) ON at the back of your computer?
> Is your Power cable free of defects?
> Is your plug overloaded with other appliances?
> Is your computer close to a high voltage appliance or transformator box?
> Does the computer work in another room?