Had the same problem once. Tried nearly everything, nothing happened. Tried to recharge it with the computer but the clip showed no sign, then tried again with a bought charger (the thing you plug in the wall socket)… seemed that nothing happened as well. But then I could switch it on again. I also think that it might have been to empty. Perhaps just try to plug it in two or three times, altough it doesn´t seem to work. Hope it helps!