Translation:My notebook is missing!
Wouldnt this be better to say, "I dont see my notebook" or "I can't find my notebook" instead of the notebook is missing because of the phrase 不见？
If you were to analyze the meaning of the individual characters, it absolutely can't be "Laptop." The word 笔记本 consists of the characters for pencil (笔), record (记), and book (本). So, you can imagine a "book for recording things with a pencil," which can only be a "notebook."
Well, actually the word for "laptop" in Chinese is "笔记本电脑" or "笔记型电脑", which literally means "notebook(-like) computer".
And many people would say "笔记本" or even "本" in conversation.