Its been a great work horse for several years.  The mower itself is pretty beat up but it always starts and gets the job done.  About two months ago, when I would start it up and engage the blade, it would die.  Acted like a safety switch was killing it as I engaged the blade.  I could slowly move the lever up and most of the time I could get it going.  Last time I was mowing I hit a fence post with the right from wheel, gave it a pretty good jolt and it died immediately.  Can not get it to start at all, will not turn over, no power.  I checked the battery, the fuse and both are good.  I did a visual inspection of the seat safety kill switch and it seems fine.  So now I am stuck.  Not much of a mechanic, but I tinker till I figure things out.  Before I start taking everything apart and have a bigger mess than when I started, does anyone have a specific suggestion?  It has a Kohler engine model CV16S.