All the lights and radio work but is completely dead when you try to start

Hello, automatic or manual transmission equipped vehicle? Manual - check the clutch safety switch to ensure it's showing the clutch is engaged. Automatic, check the transmission range sensor to ensure the vehicle is seeing you are in "park" or "neutral" gear. Try neutral, even, and see if that makes a difference. Are you using a properly programmed key? An unprogrammed key will not start the vehicle. The starter motor could be a concern. I'd check all those things in that order. But first off, make sure your battery is fully charged and able to sustain a load! That's item number one for sure. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops

Yes, check battery first!