I can't get my Craftsman 200mph gas blower to start?

I can't start my Craftsman 200 mph gas blower to start. It is about 3 years old & was sold with a Special Edition Label. Last year I had Sears replace the pull chord since it pulled right out of the blower. At that time it was still under warranty, but that has since expired. I used the blower last year after the chord was replaced, but when I went to use it a couple of weeks ago, I couldn't get it started. I just changed the spark plug and I also rinsed out the foam pad (which I assume serves as an air filter). Sears now wants $70 just to look at the problem which is hardly worth the cost at this point. I thought that if this is something I could repair on my own I could avoid the expense of buying a new blower. Any suggestions???