After a year of sitting in my shed (dead) I decided I was going to try & get it running. Well I put some seafoam in the carb, cleaned the filters, & cleaned out the muffler & spark arrestor. I let it sit w/ the seafoam over night & tried to start it the next morning. It fired right up & all was well. So now a day later, I filled it up w/ some mixed gas (Stihl 50:1 & Stabil) so it would be winterized until next year. I went to fire it up & the chord wouldn't budge. What would have changed between yesterday when it was running just fine & today when I got nothing? Is there anything I can do? Please help.