It sounds as though your chain brake is "ON". Try pulling back on the chain brake bar at the front of the saw. It may take a good bit of pressure to unlock the brake. It will kind of snap back if you pull hard enough. It may take about 10 pounds of pressure to get it unlocked. If it snaps back towards the saw grip, that should solve your problem. Try starting the saw and see what happens.
Lew, May 2008