Chevy 1999 silverado won't start

With all the electronics in todays cars you are only a key turn from being stuck. Sometimes the parts just goes without any warning. To start I would go with the basics and check all the fuse particularly the fuel pump and ignition fuses. If they test good then you need to know if you have a fuel or ignition problem. When the motor cranks the problem is most of the time a fuel or ignition problem and in some rare cases its a timing issue. Check for spark at the plug wires . If there is no spark then you have a ignition problem but if you do have spark then its a fuel problem. Good luck :)