You could probably get a LOT more help here if you gave more detail.
Your mower engine runs or not? What engine is it make/model
Any sound you hear when you turn key. (the smallest click etc.)
#7
rmancini
Since it just recently happened on my ZT mower, I'd have to agree with shiftsuper175607.
Mine wouldn't start, click, groan or anything what-so-ever.
Just prior to giving up and calling in an air strike on it, I realized that the PTO knob was engaged.
Once it started and all was well, the first thing I did was to try and figure a way I could blame it on the wife.
Couldn't do it!