No power at all

Hello,
My Dell Inspiron is pretty old and has started breaking down. At first it wouldn't turn on at all and then it was fixed and I was told to only use it either with the battery and no power source or take the battery out and use a charger. And that worked for a while but now even with the charger and no battery it isn't turning on. No couple seconds of fan or backlight,nothing. Please help.