Answers

The questions people actually ask about their hardware, each answered directly and backed by the test that settles it.

• What is my screen resolution?Your screen resolution is the number of pixels your display shows, written as width × height. The panel below reads it from your browser the moment the page loads — no download and nothing to configure.
• What is my monitor's refresh rate?Refresh rate is how many times per second your display redraws, measured in hertz. Press start below and the test times how often the browser can present a frame, which on a healthy system matches your refresh rate.
• Why is my microphone not working?Nine times out of ten a microphone that has stopped working is muted, or the computer is listening to a different input than you think. Speak into your mic below: if the meter moves, the hardware is fine and the problem is in whichever app was failing.
• Why is my webcam not working?A webcam that fails in a meeting has usually not broken — it is far more often held by another app, blocked by a permission, or sitting behind a closed privacy shutter. Start the preview below and you will know in a few seconds which it is.
• Is my mouse double clicking on its own?If one deliberate press produces two clicks, the micro switch inside the button is worn and bouncing. Click slowly in the test below with a clear pause between presses: any extra click you did not make is the fault, and it is mechanical rather than a software setting.
• What is my mouse polling rate?Polling rate is how many times per second your mouse tells the computer where it is, measured in hertz. Move the mouse continuously over the test below for a few seconds and it will count the reports as they arrive.
• Does my controller have stick drift?Stick drift is an analog stick reporting movement while nobody is touching it. Rest your controller on a flat surface, take your hands off, and watch the values below: readings that sit consistently off centre, or wander in one direction, are drift.
• How many keys can my keyboard press at once?That limit is called rollover. Hold down several keys at once in the test below and it will show how many your keyboard reports together — most membrane keyboards manage between two and six, while boards advertising n-key rollover have no practical limit.
• Why is my keyboard not typing?Press the keys that are failing in the test below. If a key lights up, the keyboard is sending it and something else is swallowing it. If it never lights up, the keyboard is not sending that key at all — and that is a hardware problem.
• Are my left and right speakers swapped?Play the left channel below and listen to which side it actually comes from. If sound labelled left arrives on your right, the channels are swapped — almost always a wiring or adapter problem rather than a fault.
• Does my screen have dead pixels?Run the fullscreen test below and look closely at each flat colour. A pixel that stays black on every colour is dead; one that stays lit in a single colour is stuck. Checking several colours matters, because a faulty pixel is invisible against a background of its own colour.
• Is my touch screen broken?Run the test fullscreen and drag one finger over every part of the screen. Cells you touch turn green; anything still grey at the end is an area your screen did not report, which is a dead zone in the digitiser.