What does it mean once my LED light blinks on top of and off on my laptop?

I got a parvenu charger today and I heard when the LED charger light blinks it means something is bad. The charger has been charging my laptop just superb now and there are no problems at all. My old charger I brought within to Best Buy and they same there was no emf coming out of it and to contact Entryway. So I contacted Gateway and they sent me a new warhorse. To make a long story stumpy, I just want to know what it method once the LED light blinks and the warhorse is still charging. Because whether it is anything bad I module be mad because I JUST got a new charger and I don't want to grasp a new battery if that's the case.