Start by checking the battery voltage and cleaning the connections to the battery. You can use a voltmeter to check voltage or just turn on the headlights and see if they are dim or bright (low voltage = dim headlights). Once battery is checked and your sure it's not the problem, remove the starter and take it to an auto part store. Many auto part stores will test the starter for free. The clicking can be a lack of battery power, poor connection or faulty starter.
dead battery bad starter solenoid bad starter loose or corroded battery or starter cables
your battery is flat Could be that your starter is dead. The clicking is the starter solenoid. That's a good thing that it is at least clicking. Replace the starter.
Are you positive the battery is dead? Have you tried to jump start it? That clicking could be the starter relay.
Battery is dead or you have a bad solenoid. Connections at the solenoid and/or starter could be loose or corroded.
Dead cell in the battery or corroded or loose battery cables.
dead battery or bad starter (with the clicking, I'm 95% sure its the battery)
A clicking sound when you turn the key could mean your battery is dead. It could also indicate the starter is going out.
dead battery or bad starter.
A very low (but not quite dead) battery will do that. It's the starter relay trying to work.
1. Starter is frozen (bearings seized) 2. Poor contact at starter solinoid 3. Low or dead battery.
Clicking = Dead battery/not enought power to start the car Grinding = Bad starter
Check your battery connections. If they're tight and no corrosion is present, then your battery may be dead. Recharge or jump start the battery. Still clicking? Replace the starter.