Chainsaws

A while back I asked about my new 455 Rancher that started throwing the chain every time I start it up -- reference number 120128-000157. The answer indicated that I must have bound the saw up somehow and bent the bar. I was told that once the chain has been thrown the it is junk too. So...

I tried a new chain. It threw the chain immediately, as soon as I started the saw and hit the throttle the first time. So I bought a new bar and another chain. It threw the chain immediately, as soon as I started the saw and hit the throttle the first time!!

This saw was purchased on 10/29/2011. It was used maybe a total of 90 minutes, to cut some trees that had already been felled by a professional company. I am pretty sure I didn't bind the saw at all. At any rate - it is pretty much worthless as it is. Any ideas what to do next?

By the away: I bought the thing I was thinking the Husqvarna name meant it was a bit more durable and of higher quality than the cheaper Home Depot saw I replaced. The Home Depot saw has about 10 years on it, has never had to have the bar replaced, and was worked hard clearing land, probably about 60 hours per year. Thank heaven it still works, since my new saw does not.