Testing Arrow Keys Properly
Press each arrow key once. Each one lights up and stays green, so you can work through all four without keeping track yourself. That single pass answers the most common question — is the key sending anything to the computer at all — and it takes about five seconds.
The second pass matters more, and almost nobody does it: hold two arrows together. Up and Right at the same time is the diagonal a game needs, and it is where cheap keyboards fail. Watch the "held at once" counter — it should read 2 while you hold both, and 3 if you can hold three. A keyboard that registers each arrow perfectly on its own but caps at one held key is unusable for gaming even though a single-press test declares it healthy. That is a matrix limitation rather than a broken key, and the N-key rollover test measures how far it extends across the rest of the board.
The third pass is the one that catches remapping. Hold Shift, then press an arrow. Hold Ctrl, then press an arrow. On a working keyboard the arrow still registers with a modifier down. If it stops registering, the problem is software intercepting the combination rather than the switch — usually a screen-reader shortcut, a gaming macro layer, or a spreadsheet application that has grabbed the chord.
The WASD cluster below the arrows is there for a specific reason. If your arrow keys are genuinely dead and you need to keep playing, most games let you rebind movement to W, A, S and D. Testing them here first tells you whether that fallback is actually available before you sit down to rebind. It also separates two very different faults: arrows dead but WASD fine points at those four switches, while both clusters failing together points at the controller or the driver.
On a laptop, one more thing to check. Compact keyboards often put Page Up, Page Down, Home and End on the arrow keys as Fn-layer functions. If pressing Up scrolls a whole page instead of moving one line, the Fn lock is on rather than the key being broken — look for an Fn Lock or F-Lock indicator. For the rest of the board, the laptop keyboard test covers every key in the real layout, and the full keyboard test is the place to start if more than the arrows are affected.