Grammar

Spoiled while acceptable might not be the best word.

Maybe malfunctioning?

As Bobsal mentioned, SPOILED, is very likely not the word you want, Jane.

Also the passive, WAS ....ED, points to another person, or you, damaging the computer.

Did the computer itself break down or did some person do something to cause a breakdown?

Hi JTT,
the computer broke down itself.

Hi all,
thanks a lot for the guidance.

Then you definitely don't want the passive.

The tablet John acquired at that garage sale still works. But the computer I bought failed only two weeks later