Trykknappen er ødelagt.

Because Norwegian usually writes compound nouns as one word.

• trykk = press / push
• knapp = button

So trykknapp means push button, and trykknappen means the push button.

This is very common in Norwegian. Where English often uses two words, Norwegian often makes a compound:

• togstasjon = train station
• dørhåndtak = door handle
• lysbryter = light switch

The ending -en marks the noun as definite singular: the.

So:

• en trykknapp = a push button
• trykknappen = the push button

In Norwegian, the definite article is often attached to the end of the noun instead of being a separate word like English the.

Because in a simple sentence like this, Norwegian normally just uses the noun in its definite form:

• trykknappen = the push button

You usually add den only in special situations, especially when there is an adjective before the noun:

• den ødelagte trykknappen = the broken push button

So:

• Trykknappen er ødelagt. = correct
• Den trykknappen er ødelagt. = possible in certain contexts, but it sounds more like that push button or gives extra emphasis

Er is the present tense of å være, which means to be.

So:

• jeg er = I am
• du er = you are
• han/hun er = he/she is
• trykknappen er = the push button is

In this sentence, er simply means is.

Ødelagt is the correct form here.

It means broken / damaged, and in this sentence it is used after er as a predicate adjective:

• Trykknappen er ødelagt. = The push button is broken.

A useful comparison:

• en ødelagt knapp = a broken button
• knappen er ødelagt = the button is broken
• ødelagte knapper = broken buttons
• knappene er ødelagte = the buttons are broken

So ødelagt is the normal singular form here.

It is historically a past participle, but in sentences like this learners can usually think of it as functioning like an adjective meaning broken or damaged.

So in practice:

• Døren er ødelagt. = The door is broken.
• Telefonen er ødelagt. = The phone is broken.

You do not need to worry too much about the label at first; the important thing is how it is used.

Yes. Ødelagt can cover both ideas, depending on context.

For example:

• Telefonen er ødelagt. = The phone is broken.
• Bilen ble ødelagt i ulykken. = The car was damaged in the accident.

So it can mean something no longer works, or something has been harmed/damaged.

Yes, but the meaning is slightly different.

• Trykknappen er ødelagt. = The push button is broken.
• Trykknappen virker ikke. = The push button doesn’t work.

The first suggests it is damaged or broken.
The second only says it is not working; maybe it is broken, but maybe there is another reason.

A learner-friendly breakdown is:

• trykk: roughly like trük with a short vowel
• knappen: roughly KNAHP-pen

A few things to notice:

• y in Norwegian is not like English y. It is a rounded front vowel, somewhat similar to the German ü.
• Double consonants like kk usually mean the vowel before them is short.
• The kn at the start of knappen is pronounced with both sounds in Norwegian.

A rough learner version might be: TRYK-kna-pen

A rough guide is:

Ø-delagt

Things to notice:

• ø is a vowel English does not really have. It is somewhat similar to the vowel in French peur or German schön, depending on dialect.
• The g in -lagt is pronounced.

A rough English-friendly approximation might be: UR-deh-lahkt but that is only approximate.

The sentence follows normal Norwegian main-clause word order:

Subject + verb + complement

• Trykknappen = subject
• er = verb
• ødelagt = complement

So:

• Trykknappen er ødelagt.

This is very similar to English:

• The push button is broken.

Not in a normal full sentence. Norwegian usually needs an explicit subject.

So you would normally say:

• Trykknappen er ødelagt.

In notes, labels, or very informal contexts, shorter fragments can appear, but for standard grammar practice, include the subject.

Yes, if the context already makes it clear which button you mean.

• knappen = the button
• trykknappen = the push button

So:

• Knappen er ødelagt. = The button is broken.
• Trykknappen er ødelagt. = The push button is broken.

The longer form is simply more specific.

The indefinite singular form is:

• en trykknapp = a push button

So the pattern is:

• en trykknapp = a push button
• trykknappen = the push button

This tells you that trykknapp is a common-gender noun in Bokmål.