You said you had them in the garage. Were they on the concrete floor? Concrete will suck the heat right out of the bottles, causing the yeast to be sluggish or even dormant. This is a very common newbie mistake, so don't feel bad. LOTS of guys do this.
Put them on TOP of your fridge for a week or so. The heat goes up off the coils in back and comes out on top across whatever is there. The yeast will love it up there.
HTH-