Something you want to replace

you should say:
what it is
where it is
how you got it
and explain why you want to replace it

When it comes to the thing i want to replace , the first comes into my mind is my laptop.
It's a silver Mac pro with neat appearance and elegant design. It is now lying on the desk in my dormitory. Because i do not have the necessity to take it here for this exam.

As for how i got it ,after university entrance exam, my mother bought this computer as a gift for my entry to college. unlike many American parents who buy a car, Chinese parents prefer to buy something such as computer、Smartphone、Camera when their children are going to be a university student.

But here are some reason why i want to replace it.
The first point i want to begin with is that It's screen is too small. As you know , big screen can provide you with more visual enjoyment when you watch a movie or just browse website. So at this point , my laptop can not satisfy my expectation.

And the point i want to add is that it is not very multi-functional.
MacOS and windows are two distinguishing operating systems. Generally speaking, windows has more popularity. Many games like LOL can only be played on windows.

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satisfy is to fulfill or meet a want, need, requirement, or expectation.

OS：operating system
brilliant 才华横溢的; 明亮的;