2007 Camry won't start what are main possibilities with this sound?

Loud clicking sound is usually the alternator.

It could be the battery connections are too corroded. If it isn’t that, i would say it’s the battery.

Sounds like the relay clicking because not enough battery power. Maybe some light was left on last night. How old is the battery, 5 years? You might have to go to Costco to get a new one.

Dead battery. You left the dome light on.

Just gave her a jump start. Definitely a drained battery. Thanks all.

Sounds like a battery to me as well. If you replace that and it happens again in the near future, your alternator may be bad as well, so I would get the alternator tested as well since that’s free. I have rarely had a bad alternator not require a new battery, but either way, the battery needs some attention, if not replacement.

@RocketGuy I prefer Autozone. Decent price, but more amps. On a cold winter morning when 230 CCA won’t cut it, I am thankful I spent an extra $10 across the street for 650CCA. Starting up on the first try in three revs beats not starting after 30 seconds of “Rurr-ur-urr-rr… click!”