Could be the battery is drained or bad. Could be battery connections at battery and or starter are dirty and or loose. Could be starter solenoid is bad. Could be starter is bad.
The car won't start but it is clicking
Why is your 1993 Altima Nissan making a clicking noise but does not start?
I actually had this problem with my first xbox. It turned out to be the hard drive.
If clicking while trying to start then might be a bad starter. If clicking while running, then might be valve/lifter noise.
Clicking usually is a sign of a bad battery or starter
A clicking sound when you try to start the car is a dead battery. It may be that the alternator is not charging it properly.
If the 1996 Olds Aurora will not start and there is a clicking noise from under the front panel, check the starter. The clicking noise is probably from the starter solenoid.
Are you positive the battery is dead? Have you tried to jump start it? That clicking could be the starter relay.
h/lamp & tns relay clicking when car is off & car will not start
check your battery then the connections if it still wont start try changing the starter solenoid if possible
stater or silanoid
Try clicking start, click on run and type iTunes. It should start up.