What are the most important things to check on a "used" computer (LAPTOP) before buying it?

Examine the exterior and interior angles of laptop and make sure there are no traces of collisions or small incisions

Check the computer screen and the lit and also see the corners that were different colors or distorted, check the absence of white spots on the screen.

Check out the keyboard buttons and drive

Check memory RAM it must be a same in bios.

Check the wired and wireless laptop network cards.

first we check the ram and processor speed and model etc

Check Model, Market Price, Condition

les caracteristiques et leurs fiabilites

Before one purchase a used laptop, he must consider the following

1.the brand name ,that is whether the brand produce quality products

2.the duration of the battery

3.the compact disc/ the memory disc

4.the accessibility of internet

5. the lifespan of the laptop

Thanks for invitation.

if you willing to buy a new used laptop you should follow the following tips:

Tip # 1: Check RAM ( memory) and processor (speed)

Find the activities for which you want to use the laptop for to determine the minimum RAM and CPU you require. For example if you need the new used laptop for basic use Email, web surfing, picture sharing, basic office duties, personal finance you need at least  RAM ( memory ) 2 GB and processor ( speed) 1GHz, if you need the laptop for intermediate as use downloading/managing music, basic creative software, advanced office duties you need 4 GB and 2GHz ; and if you need it for more advanced use such as all of the above plus Movie/photo/music editing, gaming, web hosting, advanced features you need 6GB+ and 4GHz.

Tip # 2: Check the battery

If you plan on buy used laptop “unplugged”, look for a notebook with a lithium ion battery (for longevity away from a power source). However, most batteries have a life of 3 years, so the battery in your used notebook may already be dead or weak. Consider purchasing a new or additional battery.

Tip # 3: Inspect the used PC before you buy it

·         Frame – examine the case and chassis. Look at the corners of the case for signs of impact. Cracks will at minimum cause squeakiness and can potentially result in a laptop that disintegrates. Look for other irregularities, such as loose hinges, warping, lid alignment, and even missing parts like screws and port lids.

·         Screen – check the condition of the screen. Do not get stuck with a screen that flickers or has uneven brightness. It could mean loose connections that cannot be repaired or a faulty backlight. Check for stuck or dead pixels, which means white spots on the screen. Some pixels may get stuck and are repairable others may be dead

·         Peripherals – look over the keyboard and track pad (or track point). These are the most used parts of the computer. Notice any damage or irregularities. Test the CD drive as well if you want to be able to install new software.

·         RAM – the amount of RAM (or memory space) greatly determines the speed of your laptop or computer. When inspecting your used notebook, check for available memory slots. RAM is affordable these days and you can upgrade it according to your needs, if there are open memory slots.

I advice you too to buy a reputable brand , don’t pay too much and be aware of the risk of buying from an individual vs. a retailer.

Processor

Ram

Battery

                              .

I agree with the given answers

test :

usb port

micro speaker

the pc must have numeric kayboard

the screen musd be led not lcd and must be HD

the pro must be i3 or better

the ram must 4G minimum

the hard drive 500GB minimum

if you are designer

the graphic gard must be invidia not intel

Most importantly the Processor, RAM, Storage capacity of Hard drive & then the OS.

The screen size may be a concern for few also is check the asthetics of the notebook in case there is nay physical damage.