Bike won't shift from 1st to 2nd, will shift into 2nd when I tell it to go to 3rd
Hey guys. This is my first post here, and I only recently bought my first bicycle so you'll have to forgive me for using really "immature" terms for this question. Unfortunately, I don't really know what to search for to see if this question's been answered before.
I was out riding my mountain bike today like I have been for the past few days and was heading home. On the way home, I have to go up a pretty big hill. So as I'm slowly heading up it I shift down to 1st from 2nd (the "big" gears) and all seems well. However, as I hit a flat part I try to shift it back up into 2nd and I noticed that it didn't seem like anything changed. Up a hill again, I shift down to 1st and I notice it feels just a bit weird, like nothing's happening.
Once I get home I hold my back wheel up (don't have a bike stand or anything) and start spinning the pedal, shifting up from 1 to 2. The... uhh, thing that moves when you shift to guide the chain moves fine. But the chain doesn't move onto the next ring. I shift it into 3rd, and the guide moves again, this time the chain moves but only onto the second ring, like it should if I had only put it in 2nd.
I just bought it and the LBS I got it from gives me a year warranty, so I'll be bringing it to them on Tuesday. But in the meantime I was hoping you guys could give me anything I could check to be a simple fix so that I can ride it tomorrow easily (I've been trying to ride an hour a day - lose weight).
Thanks for any help or past threads you can give me.