French phrase
Le modem ne s'allume pas.
Meaning
The modem won't turn on.
When to use it
The modem is not powering on. It is a neutral factual report used in troubleshooting.
Example dialogue
Le modem ne s'allume pas.
The modem won't turn on.
Essaie de le débrancher puis de le rebrancher.
Try unplugging it and plugging it back in.