Secondhand desktops These computers are brought from government auctions and are office computers. They come with an operating system and everything you would need, just plug it in and turn it on! The models are usually Compaq,Dell, Apple or HP which is the trusted name for most office based computers. All computers also come with a 6 month warrenty Secondhand laptops The same deal as above, quality laptops with an operating system and everything you would need.