Stihl MS460 wont start

[taxidermist]

Gentlemen: This is a great forum. This afternoon, my MS460 refused to start although it was running okay last week when I shut it down. After many crankings, I tried some ether. When that did not fire, I put a screwdriver into the spark plug boot and pulled the rope vigorously, several times, with no detected electrical charge. From what you all have written, my coil must be bad. Or, is there something else to look at? Can the throttle/choke switch get out of sync somehow?. As an amateur, should I try replacing the coil myself?

Did you remove the spark plug and ground it out rather than a screwdriver?

Also make a new post of your problem and you will get a better response.