How to choose and test a used laptop or PC
Buying a used laptop or PC requires careful checking. Even a device that looks fine on the outside may have problems with the keyboard, screen, storage, cooling or other parts. This guide covers how to pick a used computer, what to test before buying and which issues are important to spot before handing over the money.
How to test a used laptop before buying?
Before buying, check the body, screen, keyboard, ports, battery, storage and cooling system. Separately test the screen for dead pixels and even backlight, and the keyboard - to make sure all keys respond. FullTestPC lets you run these checks right in the browser.
How to test a laptop or monitor screen?
Check the screen for dead and stuck pixels, backlight bleed, spots, uneven brightness, color accuracy, gradients and flickering. A fullscreen monitor test with solid colors and test images makes this easy.
How to test a laptop or PC keyboard?
Press every key one by one, including letters, numbers, function keys, Ctrl, Shift, Alt and the arrow keys. Pay attention to keys that do not respond, trigger only sometimes or need to be pressed twice. You can test the keyboard online with no software to install.
How to test a mouse or trackpad?
Check the left and right buttons, make sure there are no double clicks from a single press, the cursor moves smoothly without jumps or sticking, and the scroll wheel and trackpad gestures work. Watch out for random clicks or a freezing cursor. You can test a mouse or trackpad online right in the browser.
What to check in a used PC before buying?
Check the case and component condition, the monitor, keyboard, mouse, USB ports and other connectors. It is also worth checking temperatures, fan noise, storage and the computer's stability under load.
What problems are most common on used laptops?
Common issues include a worn-out battery, broken keys, dead pixels, screen backlight bleed, overheating, noisy cooling, storage problems and damaged connectors. Some of these can be spotted even during the physical inspection of the device.
What to bring when testing a used laptop or PC?
Bring the charger, a mouse if needed and a pre-made checklist. To test the screen and keyboard, it is enough to open FullTestPC in the browser on the device you are testing.
How to test a CPU before buying?
Match the model and frequencies via System Information or CPU-Z, check idle temperatures with HWMonitor. To evaluate performance, run the online CPU test right in the browser — it shows compute speed, stability and possible performance drops under load.
How to test a GPU before buying?
Check the fans and warranty seals, make sure the GPU is detected in Device Manager without errors. To test stability and performance, run the online GPU test — it measures FPS and detects sag or stuttering under graphics and compute load.
Ready to test?
Run the tests right in your browser or follow our step-by-step checklists.