Husqvarna 240 want start at all - Husqvarna Chain Saw 18" 450 Model 966955438

Sounds like the ignition module or spark plug. The ignition module is what controls the spark plug that gives your saw the firing capabilities. Before you purchase one of those, replace the spark plug and see if that works. The 240 is a newer husqvarna; so I am skeptical to say it is the ignition module. However, any new product can have a bad part on it.

Your saw may have gotten flooded and won't start. Make sure your gas mixture is 50/50 gas to mixing oil. Always use fresh gas. If you make up gas and don't use a whole gallon at a time, put some fuel stabilizer in the mixture; so it will still be fresh the next time you use it.