[dsherw00d]

A quick test would be to check the 12v energizing wire going to the starter during the no start condition. In older Chevy's it's purple. If this isn't getting 12v when the key is turned, then the computer isn't sending 12v out. Another quick test to see if it's the starter locked up is to turn the headlights on and try to crank. If the juice is going to the starter and not turning it, the lights will dim. If they don't dim, then I would say no power is getting to it.