Well, this is embarrassing. But, even though it is, it is required that I follow up with you all and report back.
Just returned yesterday - my daughter and son-in-law had pulled the
BX24 out of the field and up to the yard. It was parked looking forlorn and still not starting.
Having recovered the basic owners manual (which isn't that helpful) from 3 states over, it made sense to check the fuses (thanks tookielee), but they were all good. I still don't know how to check the slow blo fuse, but...luckily...that wasn't it...
I read and re-read your advice about the PTO switch. Ning shared a thread from 2013. And I found a thread dating back to 2006. All pointing to the PTO.
And that was it. I had failed to really see that the PTO lever itself was NOT springing back to the very top of the slot. It was sticking/stuck against something with enough "stickiness" that even letting the lever "fly" back, was still sticking. It was a simple tug of the lever to seat it firmly and it fired right up!! Yikes.
Thanks everyone. Sincerely -- thanks, you all have saved me some bucks and frustrations. Even with the egg on my face, it's worth it. Please don't ever stop sharing your experience. Thanks again.