Did the car just quit starting one day with no previous symptoms?
How long before it failed to start had it started previously?
How many miles on the car?
Check out the starter, sometimes the brushes jam in the holders or they have got too short or the starterjust fails.
Check out the cables to the starter, battery terminals that are corroded can allow the flow of low power but fail at higher power.
Likewise the battery can fail inside at calls for higher amperage.