A bad/disconnected cam position sensor won't cause a no-start situation, just a CEL. Check the crank position sensor. Another possibility is the "main relay". Some Hondas have issues with cars not restarting after getting hot because there's a fault in the main relay. I haven't heard of that on an aveo, yet...

Definitely check to make sure the car is getting spark and fuel, before you start replacing sensors, though. I could be a loose connection to the ignition coil, as well.