Appearance
The first thing you need to evaluate the appearance of the device. If the laptop noted chips, cracks and scratches, it is best to opt out of the purchase of such a computer. This is directly related to the fact that if the appearance of the laptop leaves much to be desired, so he was treated inappropriately, and this, in turn, can be the cause of the failure and the occurrence of various malfunctions of the computer components.
The age of the computer
Of course, we should not forget about the age of the computer. If the laptop is used for more than two years, the final cost should not exceed half of the original amount. Of course, it is best to know initial value of a particular model and, then, interested in age and draw their own conclusions based on the obtained information (for example, to find out its real price).
Accessories
Naturally, forget about components is also not necessary, because it depends on how well will work various apps, games etc. Maximum attention should be paid to: video card (its volume, resolution), the RAM and the processor. The best way is to compare installed on the laptop with the existing analogues in the Internet shopping and read reviews about them. It is worth noting one important caveat - if the laptop has only an integrated video card, it is better to abandon the purchase (if you're going to use the device for gaming and graphics applications), as these adapters are not designed for demanding applications.
Battery status
In addition to the above you need to pay attention to the battery. It is worth remembering that if it was used for several years, then it will have to be replaced. Of course, it is best to check the efficiency with the help of special programs or just to know how it will work without a mains connection.