pasokon ga kosyousita rasiku, dengen wo irete mo gamen ga kurai mama datta.

Here らしく is the -く form of らしい.

らしい can mean it seems / apparently / I hear that..., based on evidence or information. So 故障したらしく means something like:

• apparently it broke down
• it seems to have malfunctioned

It sounds less direct than simply saying 故障した (it broke / it malfunctioned). The speaker is inferring this from what they observed, such as the screen staying dark.

Because 故障した is the plain past form of the verb 故障する (to break down / to malfunction).

So the structure is:

• 故障した = broke down / malfunctioned
• 故障したらしい = it seems to have broken down
• 故障したらしく、... = apparently it broke down, and...

If you said 故障らしい, that would sound more like it seems to be a malfunction / it seems to be broken, which is different in nuance. The sentence is specifically built from the verb phrase 故障した.

パソコンが marks the computer as the grammatical subject of the clause.

Using が here is natural because the sentence is presenting what happened to the computer:

• パソコンが故障したらしく = it seems the computer malfunctioned

If you used は, it would sound more like setting the computer up as the topic for comparison or discussion:

• パソコンは故障したらしく...

That is possible in some contexts, but が is more straightforward when simply describing the event.

電源を入れる means to turn on the power.

Then 〜ても means even if / even when.

So:

• 電源を入れても = even when I turned it on
• more literally: even after turning on the power

It shows that the expected result did not happen. Normally, if you turn on a computer, the screen should light up. But here, even after turning it on, the screen stayed dark.

Japanese often omits subjects when they are obvious from context.

In 電源を入れても, the person turning on the power is not stated, but in English we would usually understand it as something like:

• even when I turned it on
• even when we turned it on

Japanese does this very often. If the doer is clear or unimportant, it is simply left out.

まま means in the state of / remaining as.

So:

• 暗い = dark
• 暗いまま = remaining dark / still dark
• 暗いままだった = remained dark / stayed dark

The key idea is that the state did not change.

So the sentence is saying that after turning on the power, the screen did not become bright or display anything—it stayed dark.

Because 暗かった just means was dark. It describes the condition, but not necessarily the idea that it stayed that way.

暗いままだった adds the nuance of remaining unchanged.

Compare:

• 画面が暗かった。 = The screen was dark.
• 画面が暗いままだった。 = The screen stayed dark.

In this sentence, that nuance is important, because the speaker is saying: even after turning the computer on, nothing changed.

Because the whole sentence is in the past.

まま behaves in a noun-like way here, so 暗いまま is followed by だ / だった:

• 暗いままだ = remains dark / is still dark
• 暗いままだった = remained dark / was still dark

So even though 暗い is an い-adjective, once it connects to まま, the final predicate becomes ままだ / ままだった.

Because they mark the subjects of different clauses or descriptions.

1. パソコンが故障したらしく

   • the computer seems to have malfunctioned

2. 画面が暗いままだった

   • the screen remained dark

Japanese can have more than one が in a sentence when each one belongs to its own part of the sentence. This is very normal.

No. 電源を入れる is a general expression meaning to turn on the power.

It can be used for many devices, such as:

• computers
• TVs
• air conditioners
• appliances
• machines

For a computer, both パソコンの電源を入れる and パソコンをつける may be heard, but 電源を入れる sounds very standard and precise.

It connects the first clause to the second and makes the sentence easier to read.

The sentence is basically:

• Apparently the computer had malfunctioned,
• and even when I turned it on, the screen remained dark.

The comma shows a pause between the inference (it seems it broke) and the evidence/result (the screen stayed dark).

No, not in this sentence.

らしい has more than one use:

1. seems / apparently
2. typical of / like

Here, 故障したらしい clearly means it seems to have malfunctioned.

The typical of meaning would appear in sentences like:

• 男らしい = manly / masculine
• 子どもらしい = childlike

So in this sentence, it is definitely the apparently / seems meaning.

It is very natural. It sounds like someone describing a problem they noticed with a computer.

The nuance is:

• the speaker is not 100% flatly asserting the diagnosis, but inferring it
• the evidence is that even after powering it on, the screen stayed dark

So the sentence feels like a realistic observation:

• Apparently the computer had broken down; even when I turned it on, the screen stayed dark.

It sounds calm, matter-of-fact, and natural in everyday Japanese.