Wouldn't turn over or wouldn't start?
Did the starter make a "click" but nothing else?
Disclaimer - I have not been inside of my Volvo starter - but I'm sure other's here have. There is usually a starter relay and solenoid to kick the starter into the ring gear then an armature within the motor to turn that gear.
If no click:
Then it's likely the key fob battery, immobilizer, ignition switch, starter relay or the solenoid.
If it made a click:
And it wouldn't turn over but did on another try there are usually brushes in a starter that can stick as they wear down and then cannot touch the commutator to make it turn. Look to Vadis for the exploded pictures.
Or you may have a dead (shorted) pair on the commutator that may be easy to identify (with an ohm meter). Sometimes the brush material bridges can be scraped away.
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