
kaputt
broken
No longer working, broken, or damaged. Usually refers to objects or devices.
Mein Handy ist heruntergefallen und jetzt ist das Display kaputt.
My phone fell down, and now the display is broken.
broken / exhausted
Loading your saved state.

broken
No longer working, broken, or damaged. Usually refers to objects or devices.
Mein Handy ist heruntergefallen und jetzt ist das Display kaputt.
My phone fell down, and now the display is broken.

exhausted
Colloquial for completely exhausted, extremely tired, or worn out. Refers to people.
Nach der langen Wanderung war ich abends total kaputt.
After the long hike, I was totally exhausted in the evening.

ruined / broken
Destroyed or failed, often in reference to relationships, plans, or abstract things.
Durch den ständigen Streit ist ihre Freundschaft kaputtgegangen.
Because of the constant arguing, their friendship broke down.
The adjective 'kaputt' (broken/exhausted) is very often used as part of the predicate with verbs like 'sein' (to be) or 'gehen' (to go). Attributive use before a noun, as in 'das kaputte Fahrrad' (the broken bicycle), is possible, but less common.
Das Glas ist kaputt.
The glass is broken.
Two very common verbs formed with 'kaputt' (broken) are 'kaputtgehen' (for something to break by itself) and 'kaputtmachen' (for someone to break something intentionally or unintentionally).
Die alte Waschmaschine ist einfach kaputtgegangen.
The old washing machine simply broke.
The context reveals the exact meaning: if 'kaputt' (broken) refers to an object, it is broken. If it refers to a person, they are exhausted. If it refers to something abstract like a relationship, it has failed.
Der Fernseher ist kaputt.
The television is broken.
When 'kaputt' (exhausted) describes a person who is very tired or worn out, it is used colloquially. In more formal contexts, you would rather say 'erschöpft' (exhausted) or 'ermüdet' (fatigued).
Nach der Arbeit bin ich oft völlig kaputt.
After work, I'm often completely exhausted.
except / besides
Außer Betrieb and kaputt can both indicate that a device is not working. Außer Betrieb describes the state of not being in use without claiming that there is a defect; kaputt says that the device is damaged or no longer functional. Use außer Betrieb for maintenance or shutdown, and kaputt when there is damage.

Der Aufzug ist kaputt und muss repariert werden.
The elevator is broken and needs to be repaired.
Der Aufzug ist wegen der Wartung heute außer Betrieb.
The elevator is out of service today because of maintenance.