Second-hand goods are covered by the same guarantees as other goods, if you buy the goods from a second-hand dealer and they’re goods that are usually bought for personal, domestic or household use. However, your rights will depend on:
the age and condition of the goods
the price you paid for the goods
what the second-hand dealer said about the condition of the goods.
For example, “acceptable quality” for a five-year-old computer will be different from acceptable quality for a brand-new computer.
Note: The one guarantee that is quite different when you buy second-hand is the guaranteed availability of repair facilities and spare parts. This doesn’t apply to second-hand goods, unless you’re buying something that is imported and you’re the first person to buy it in New Zealand.