260 260pro seized

In '09 I bought a new MS 260, ran the saw for 3 years cylinder seized, so I went ahead and traded it for new MS 261, Love this saw, treated with kid gloves. I only cut about 3-4 cord per year, always use Sthil 2-cycle oil. Then this spring saw died, and would not re-start...Took to dealer...

Been lurking and ready all the great input on this site for a while and thought I'd throw this out there for some suggestions. I recently came across a 260MS Pro in a mystery box I bid on at an estate sale. Saw looks great, but pull on the cord to start, and nothing even moves, like the thing...