This sucks!!!! or not...

OK so for the past two days I've been trying to vacuum my floor because with three kids it can get kinda dirty quick, but my vacuum hasn't been sucking up anything. So (having had one vacuum already blow up and die on me scaring the daylights out of my children and myself) I make Brad look at it. The little part that gets all the hair stuck around it (I don't know what it's called but I'm sure my description will be sufficient to let you know what I'm talking about) isn't spinning, or it spins maybe once and then stops. So we take the thing apart, and check the belt which is fine, there's nothing wrong with it. So we're both under the assumption that it's time to buy another vacuum (this is only two years old, I've had good times with this vacuum, how am I supposed to just replace it!) *sigh* oh the woes...