Se o programa travar de novo, tente reiniciar o sistema e desconectar o cabo.

Because Portuguese often uses the future subjunctive after se when talking about a possible future situation.

So:

• Se o programa travar = If the program freezes
• Se o programa trava sounds more like a habitual/general idea: if the program freezes / when it freezes

In instructions like this, travar is the standard choice because the sentence is about a possible future problem.

A very common pattern is:

• Se + future subjunctive, imperative
• Se chover, fique em casa.
• Se der errado, tente outra vez.

With regular -ar verbs, the future subjunctive often looks the same as the infinitive, which is why travar can be confusing here.

In this sentence, travar means something like to freeze, to lock up, or to hang in a computer/device context.

So if a program stops responding, Brazilians commonly say:

• O programa travou.
• Meu computador travou.

It is a very natural word in Brazilian Portuguese for tech problems.

Yes. De novo is extremely common and natural in everyday Brazilian Portuguese.

So:

• travar de novo = freeze again

You could also say novamente, which is a bit more formal or written-sounding:

• Se o programa travar novamente...

Both are correct, but de novo is very normal and conversational, even in many written instructions.

Tente is the standard imperative form used with você.

This sentence is giving an instruction:

• tente reiniciar o sistema = try restarting the system

In standard Portuguese, commands for você use a form that looks like the present subjunctive:

• tentar → tente
• reiniciar → reinicie
• desconectar → desconecte

In spoken Brazilian Portuguese, you may hear tenta in casual speech, but in manuals, instructions, and neutral written Portuguese, tente is the expected form.

Because after tentar, Portuguese normally uses an infinitive.

The structure is:

• tentar + infinitive

So:

• tente reiniciar
• tente desconectar

This is just like English try + verb:

• try restarting
• try disconnecting

Portuguese uses the infinitive where English may use either to + verb or -ing, depending on the sentence.

Because Portuguese often leaves the subject unstated when it is clear from the verb form or from the context.

In instructions, commands, and manuals, omitting the subject is very common:

• Tente reiniciar o sistema.
• Desconecte o cabo.
• Clique aqui.

You could say você, but it is usually unnecessary here.

So this sentence is understood as talking to you without needing to say it explicitly.

Portuguese uses definite articles very naturally and very often, sometimes more often than English learners expect.

Here, o sistema and o cabo refer to specific things already understood in the situation:

• the system involved
• the cable involved

So the articles are completely normal:

• reiniciar o sistema
• desconectar o cabo

Leaving them out would usually sound wrong in this sentence.

Because the sentence begins with a conditional clause:

• Se o programa travar de novo, ...

That opening if clause is followed by the main instruction:

• tente reiniciar o sistema e desconectar o cabo

In Portuguese, it is normal to separate that introductory conditional clause with a comma, just as in English:

• If the program freezes again, try restarting the system...

Yes, you might hear congelar in tech contexts too, especially as a direct equivalent of to freeze.

For example:

• Se o programa congelar...

But in Brazilian Portuguese, travar is extremely common and often sounds more natural in everyday speech for software or devices that stop responding.

Very roughly:

• travar = lock up / freeze / hang
• congelar = freeze

Both can work, but travar is especially idiomatic in Brazil.

Because the sentence is treating both actions as things you should try to do.

So the structure is:

• tente + reiniciar
• tente + desconectar

The second infinitive, desconectar, is still linked to tente.

This means:

• try restarting the system and disconnecting the cable

If you said:

• tente reiniciar o sistema e desconecte o cabo

that would mix two structures:

• try restarting the system
• and disconnect the cable

That version is also possible, but it sounds more like two separate commands instead of one try doing these things structure.

It is best described as neutral, standard instructional Portuguese.

Why?

• tente is the standard written command form
• the vocabulary is clear and practical
• the sentence sounds like something from tech support, a manual, or on-screen instructions

It is not especially stiff, but it is not casual chat either.

A more casual spoken version might be something like:

• Se o programa travar de novo, tenta reiniciar o sistema e desconectar o cabo.

That sounds more conversational, while the original sounds better for written instructions.

Yes. The grammar stays the same.

So you can say:

• Se o programa travar de novo...
• Se o programa travar novamente...

Both are correct. The main difference is tone:

• de novo = more everyday, common, natural in speech
• novamente = a bit more formal or polished

In a technical message, either one would work.