Mower started fine over the past 2 weekends. Today it won't. Bought ether to spray in the air intake. Can't locate it. Tried all sorts of locations, no luck! Help!

Should be an air filter at some location on the engine. Mine is in a black heavy plastic enclosure about 3 1/2 inches by 2 inches (oblong shape). Might be covered with grass dust. A few shots on the filter and it efinitely should start assuming no othe problems. The filter needs to be cleaned or replaced (frequency based on amount of mowing).

And should consider checking the air filter to see if it needs to be cleaned,

And don't use either/starting fluid in small engines. Use carburetor cleaner instead. Th latter includes lubercation.

You can always spray into the spark plug hole.

What are the symptoms of the engine? Will it start at all? Please advise of the details.