Ok re-reading this you also just say ON but not START. The only reason I was starting was because it was the ONLY way I'd get a (BRIEF) flashing light -- then it returns to a solid theft lightDumb question - but did you make sure it's plugged in? There is not a lot of extra wire it could have came unplugged.
Next - you do not remove the key each time you cycle it - key STAYS in. Just turn it on....wait 10 min until light stops flashing then turn key off and back on w/o removing it and count another 10 mins. Then the 3rd and last 10 min take the key out...wait a few seconds and it will start the car. Also set a timer as it is that important.
Anyway, I'm gonna try the old cylinder today and see how it performs and causes the light to behave