Sigo sin encontrar el cargador, así que no puedo encender el portátil.

It means I still haven’t found or I still can’t find.

Literally, it is something like I continue without finding:

• sigo = I continue / I keep on
• sin = without
• encontrar = to find

This structure, seguir + sin + infinitive, is very common in Spanish for saying that a situation is still continuing in a negative way:

• Sigo sin entenderlo = I still don’t understand it
• Sigue sin llamar = He/She still hasn’t called

So here, Sigo sin encontrar el cargador means the speaker has been looking for the charger and has not managed to find it yet.

Both are possible, but they are not exactly the same.

• No encuentro el cargador = I can’t find the charger / I’m not finding the charger
• Sigo sin encontrar el cargador = I still can’t find the charger / I still haven’t found the charger

The version with sigo sin emphasizes continuation. It suggests:

• the person has already been trying for some time
• the problem is still unresolved

So sigo sin encontrar sounds a bit more like: this is still the case.

Because buscar and encontrar mean different things:

• buscar = to look for
• encontrar = to find

So:

• Busco el cargador = I’m looking for the charger
• Encuentro el cargador = I find the charger

In this sentence, the speaker is talking about the result: they have not found it yet. That is why encontrar is used.

A related sentence could be:

• Sigo buscando el cargador = I’m still looking for the charger

That focuses on the activity of searching, not the result.

Because Spanish usually leaves out subject pronouns when they are clear from the verb form.

• sigo already means I continue
• puedo already means I can

So yo sigo and yo puedo are grammatically possible, but yo is normally unnecessary unless you want emphasis or contrast.

For example:

• Yo sigo sin encontrar el cargador, pero tú sí lo encontraste.
  = I still can’t find the charger, but you did find it.

In the original sentence, no emphasis is needed, so Spanish naturally omits yo.

Spanish often uses the definite article (el / la / los / las) where English would use a possessive like my, your, or his, especially when ownership is obvious from context.

Here, it is clear the speaker means their own charger and their own laptop, so Spanish naturally says:

• el cargador
• el portátil

rather than:

• mi cargador
• mi portátil

Using mi is not wrong, but it can sound more explicit or emphatic than necessary.

Cargador means charger.

In this sentence, it most likely refers to the laptop charger or power adapter, not just any random charger.

Spanish often relies on context, so el cargador is enough if everyone already knows which device is being discussed.

Así que means so, therefore, or so then.

It introduces a consequence or result:

• Sigo sin encontrar el cargador, así que no puedo encender el portátil.
• I still can’t find the charger, so I can’t turn on the laptop.

It is a very common connector in everyday Spanish.

Similar expressions include:

• por eso = that’s why / because of that
• entonces = then / so

But así que is very natural here.

Because the speaker wants to express inability, not just the fact that they are not doing it.

• No puedo encender el portátil = I can’t switch on the laptop
• No enciendo el portátil = I don’t switch on the laptop / I’m not switching on the laptop

The second one sounds more like a choice, a habit, or a simple statement of action.
The first one clearly means: I am unable to turn it on, because the charger is missing.

So poder + infinitive is the right structure here.

Here, encender means to turn on or to switch on.

It is used for devices, lights, engines, and similar things:

• encender la luz = to turn on the light
• encender el ordenador = to turn on the computer
• encender el portátil = to turn on the laptop

In English, turn on is often more natural than switch on, but both are good translations.

Yes, portátil is especially common in Spain for laptop.

In Spain, you will often hear:

• el portátil = the laptop
• el ordenador portátil = the laptop computer

In other Spanish-speaking countries, other words may be more common, such as:

• la laptop
• la computadora portátil

So portátil is a very Spain-friendly choice.

The sentence uses the present tense:

• sigo
• puedo

This is because the speaker is talking about a current situation:

• they still have not found the charger
• as a result, they cannot turn on the laptop now

Spanish often uses the present tense in exactly the same kind of situation as English.

Yes, absolutely.

• Todavía no encuentro el cargador = I still can’t find the charger / I still haven’t found the charger
• Sigo sin encontrar el cargador = I still can’t find the charger / I still haven’t found the charger

Both are correct, but the nuance is slightly different:

• todavía no simply means still not
• sigo sin highlights that the situation is continuing

So sigo sin encontrar can sound a little more expressive or a little more frustrated, as if the search has been going on for a while.

Yes, it is natural and correct here.

The sentence has two main parts:

• Sigo sin encontrar el cargador
• así que no puedo encender el portátil

The comma helps show the pause before the consequence. In writing, that makes the sentence clearer and more natural.

So the punctuation in the original sentence is good Spanish style.