Not sure if you are looking to buy or just helping someone.
Probably nothing expensive. If you are wondering whether to buy or not, push it to start. If it starts and runs good, offer less to cover repairs. You can also try jumping battery in case it is low battery.(my guess). To go into what could be wrong can take awhile especially if you don't have access to test and all that. You probably know what the list is already.
Push to start= roll it with clutch in and in 2nd or 3rd and pop clutch at about 5 mph. Is it an auto, 3 sp or 4sp?
Can't push auto.
List without hearing it: (and it does make some difference if it's just clicking solenoid or starter is turning some)
1. Starter
2. Solenoid
3. Ignition Switch
4. Connections, hot and ground
5. Battery (which can mean VR or Gen problems)
6. "they could hear" why can't you hear?
