I am having problems with charging my laptop. When the battery on my Dell laptop started getting low I plugged the charger in but nothing was happening. I tried three different chargers and still the same. My laptop has now fully run out of battery so can no longer switch it on. I originally thought I needed a replacement battery but I was not having problems with it before and surely the laptop would still switch on when plugged into the mains? I wondered if it is something to do with the charging port as when the charger is plugged in to the mains a green light appears, but when I plug it into the laptop the light disappears. Before I buy new batteries etc. does anyone know what the problem could be?