My car will not start. A month ago it wouldn't start. At that time it was still cranking (weakly) but not starting. I bought a new battery and installed it. It still wouldn't start until I jumped it (which doesn't make sense since it's a new battery) and then it started. I took the old battery back and the worker said that the battery was fine. Keep in mind this was all a month ago and it was running fine until now.
It stopped starting up again. I did notice that the starts were getting weaker just before it stopped starting again. This time I had to get it towed. Now it will not crank at all and makes a single click and nothing more. Is this indicative of a bad starter or a bad alternator or is there something else I'm missing? All my electronics still seem to work fine, it just won't start so I'm leaning more towards the starter.
Vehicle is: 2006 Honda Civic EX 1.8L 4 Cylinder (though it shouldn't matter).
I did do a search and could not find any questions with this specific case.
UPDATE: I put in a fully charged battery (battery tested good and was charged using a battery charger) and it would not start. Like I mentioned before, a month ago it did crank (weakly) and wouldn't start. Now it doesn't crank at all and just clicks. Is this solely a problem with the starter or could this be indicative of an underlying problem?