B
As I said before, I've never been in the same room with an Ender 6, I have two Ender3 V2s. But the power cord is probably the same. If so, there is a fuse in a little drawer-like slot just above the power cord inlet. It's not convenient at all. You'll probably have to take a pocket knife to get it out. It looks more like a picture of a fuse, but there's actually a fuse in there. If it's blown, you still have the challenge of finding the short that caused it to blow. But at least you'll know what the problem is.