The console won't show an icon on the homescreen when NTRBootHaX is flashed on to it. I assume you didn't restore it if you didn't successfully install CFW. If that's the case, your card is fine it's just flashed already so it's not going to work "normally" and it will seem like the console isn't reading it due to lack of icon; that's because of the hax installed on the card.
You just need to try and install it again.....Assuming it really didn't work. Speaking of which, why didn't it work? That would help because perhaps you're doing something wrong, or like so many others you installed it already and don't realize it.