I'm stumped. I used my Stihl FS55 trimmer 2 days ago. It ran fine. I've never had a problem out of it. I get to an account today and it won't do anything. It has fire; it has gas. But it acts like the switch is off. It won't attempt to do anything. I work on it for an hour, then put it away and use another trimmer to do this account. When I'm finished, I grab my Stihl BG55 blower. It starts and runs like normal. I blow off the front (maybe running 5 minutes). I turn it off, put it in my truck, and drive around to the back of the property. I pick it up, and nothing. It has fire; it has gas. But it acts like the switch is off. It won't attempt to do anything either. In the morning I'm going to dump all the gas out of the can and machines. I will go get fresh gas and oil. And I will try again. I don't know what else to do. The gas is not old. I just bought it about a week ago. But I just don't know. Any suggestions???