Desktop computer test - monitor, keyboard and mouse

What a browser can and cannot see on a desktop

Everything attached to the machine that produces input or output can be tested: the monitor, the keyboard, the mouse, the speakers, a webcam if one is connected, and the network. What is inside the case cannot. A browser has no view of the drive, the memory, the processor temperature or the power supply, and no web page can give you one.

So this is an inspection of the parts you interact with, and the report says so rather than implying a full system check.

The monitor is the part worth the most attention

Full-screen colour fields find dead and stuck pixels; the grey field finds uneven backlighting; the gradient finds banding, which on a cheap or ageing panel shows as visible steps rather than a smooth fade.

Mouse buttons in the right order

The pointer tests check the primary, secondary and middle buttons, double-click, both scroll axes and dragging. They report by button number rather than by "left" and "right", because a left-handed configuration swaps them and telling somebody their left button is broken when they swapped it deliberately is not useful.

Related tools

Monitor test, mouse test, scroll wheel test, double click test, keyboard tester.