Troubleshooting
Use evidence before changing things.
Start with a neutral DeviceOK test when possible. Passing or failing outside the affected app changes which cause should be investigated next.
Diagnose by symptom
More device typesWhich part is giving you trouble?
Choose the affected part. We start with a live test when the browser can collect useful evidence, then show the fixes that match the result.
Microphone
Run the testGet evidence before changing settings
If it works in DeviceOK, total hardware failure becomes less likely and the app, permission, routing or OS path becomes more important.
Microphone
19 verified pathsSymptoms and diagnostic paths
Microphone Not Workingthe microphone does not work at all→Microphone Not Detectedthe browser or app cannot find the microphone→Microphone Detected but No Soundthe microphone is listed but no audio signal is received→Microphone Too Quietyour voice is detected but the level is much lower than expected→Microphone Too Loudthe microphone input is consistently too strong→Microphone Clipping or Distortingspeech peaks are distorted or clipped→Microphone Static Noisethe microphone has crackling or static noise→Microphone Buzzing or Hummingthe microphone has a steady buzz or hum→Microphone Echoother people hear an echo or repeated audio→Microphone Keeps Cutting Outthe microphone signal drops intermittently→USB Microphone Not Workinga USB microphone is connected but not working correctly→Bluetooth Microphone Not Workinga Bluetooth microphone/headset is connected but input is not working→Headset Microphone Not Workingheadset audio works but its microphone does not→Microphone Not Working in Windows 11Windows privacy/device settings can block a microphone even when the hardware is connected.→Chrome Microphone Permission Not WorkingChrome site permissions can block microphone access independently of the microphone hardware.→Discord Microphone Not WorkingIf a mic works in DeviceOK but not Discord, prioritize Discord input selection, permissions, and voice configuration.→Zoom Microphone Not WorkingA microphone that works in DeviceOK but fails in Zoom usually points to Zoom selection/permission/routing before hardware failure.→Microphone Works in Browser but Not DiscordA successful DeviceOK mic test makes complete microphone failure less likely; focus on Discord input selection and app permissions.→Microphone Permission Deniedcamera/microphone access was denied at browser or operating-system level→
Camera / webcam
19 verified pathsSymptoms and diagnostic paths
Webcam Not Workingthe webcam does not produce a usable video stream→Camera Not Detectedthe browser or app cannot find a camera→Webcam Shows a Black Screenthe camera opens but the preview remains black→Webcam Frozenthe webcam image stops updating→Webcam Blurrythe camera image is consistently soft or out of focus→Webcam Flickeringthe video stream visibly flickers→Webcam Low FPSthe camera is running at an unexpectedly low frame rate→Camera Permission Deniedbrowser or OS camera permission is blocking access→Camera Already in Useanother app or process may be using the camera→Wrong Camera Selectedan app or browser is using a different camera than intended→External Webcam Not Workingan external USB webcam is connected but not working→Camera Not Working in Windows 11Windows camera privacy, drivers, application conflicts, or a physical shutter can prevent access.→Chrome Camera Permission Not WorkingChrome camera permission and operating-system camera permission are separate layers.→Discord Camera Not WorkingIf camera video works in DeviceOK but not Discord, the likely problem is app selection, permission, or Discord configuration.→Zoom Camera Not WorkingUse the browser test to separate camera hardware/access from Zoom-specific selection and permission problems.→Camera Works in Browser but Not ZoomA successful DeviceOK webcam test is strong evidence that the camera can produce a browser video stream, so Zoom-specific settings should be checked first.→Webcam Is Blurry or Will Not Focusthe webcam image is soft, blurry or repeatedly hunts for focus→Webcam Image Is Too Darkthe camera works but faces or the whole image are underexposed→Webcam Image Is Too Bright or Washed Outbright areas clip or the camera image looks washed out→
Keyboard
12 verified pathsSymptoms and diagnostic paths
Keyboard Key Not Workingone or more keys do not register→Keyboard Not Workingthe keyboard is not responding normally→Keyboard Typing Twiceone press produces duplicate characters→Keyboard Typing Wrong Characterskeys produce unexpected letters or symbols→Keyboard Layout Changedthe active language or layout no longer matches the physical keyboard→Keyboard Input Lagkey input feels delayed→Keyboard Keeps Disconnectingthe keyboard repeatedly drops and reconnects→Bluetooth Keyboard Not Workinga Bluetooth keyboard is paired but not working correctly→USB Keyboard Not Detecteda USB keyboard is not detected→Numpad Not Workingnumeric keypad keys are not entering numbers→Function Keys Not WorkingF-keys or Fn-layer functions do not behave as expected→WASD and Arrow Keys SwappedWASD and arrow key behavior appears reversed or remapped→
Mouse
12 verified pathsSymptoms and diagnostic paths
Mouse Not Workingthe mouse does not respond normally→Mouse Not Detectedthe system or browser is not receiving expected mouse input→Mouse Double Clicking by Itselfone click is sometimes registered twice→Right Click Not Workingright-click events do not register→Middle Click Not Workingthe wheel/middle button does not register→Mouse Scroll Wheel Not Workingscroll input is not received normally→Mouse Scroll Wheel Jumpingscrolling reverses or jumps unexpectedly→Mouse Lagging or Stutteringpointer movement feels delayed or uneven→Mouse Keeps Disconnectingthe mouse repeatedly drops and reconnects→Wireless Mouse Not Workinga wireless mouse is powered but not working correctly→Mouse Scroll Wheel Not Working or Scrolling Wrongthe wheel does not scroll, jumps, or scrolls differently than expected→Mouse Button Not Workingone mouse button does not register or works only intermittently→
Controller
10 verified pathsSymptoms and diagnostic paths
Controller Not Detectedthe browser or game cannot see the controller→Controller Stick Driftan analog stick moves while physically centered→Controller Buttons Not Workingone or more buttons do not register→Controller Trigger Not Workingan analog trigger does not reach expected values→Controller Dead Zone Too Largethe stick must move too far before input appears→Controller Stick Jitterstick input changes while held still→Controller Keeps Disconnectingthe controller loses connection during use→Bluetooth Controller Not Workingthe controller pairs but does not work correctly over Bluetooth→Controller Works on USB but Not Bluetoothwired input works but Bluetooth input fails→Controller Buttons Mapped Wrongbuttons register but use unexpected mappings→
Screen / monitor
12 verified pathsSymptoms and diagnostic paths
Dead Pixel vs Stuck Pixela pixel appears permanently dark or permanently colored→Screen Flickeringthe display flickers or flashes→Monitor Using the Wrong Refresh Ratethe display is not running at the expected refresh rate→Monitor Looks Blurrytext or graphics look softer than expected→Color Banding on Monitorsmooth gradients show obvious steps or bands→Backlight Bleedbright patches appear around the edges of a dark screen→Screen Using the Wrong Resolutionthe active display resolution is not the expected/native setting→Monitor Frame Skippingthe display appears to skip frames at higher refresh rates→Monitor Colors Look Wrongscreen colors look shifted, washed out, or incorrect→Monitor Colors Look Wrongcolors have an obvious tint, look washed out, oversaturated or do not match expectations→Backlight Bleed, Glow or Screen Uniformity Problemdark or neutral screens show uneven bright areas, tint or edge glow→Screen Resolution Looks Wrong or Blurrythe desktop is stretched, blurry, too large/small or using the wrong resolution→
Speakers / headphones
9 verified pathsSymptoms and diagnostic paths
No Sound From Speakersthe selected speakers produce no audible output→One Side of Headphones Not Workingonly one headphone channel produces sound→Speaker or Headphone Cracklingaudio contains crackles, pops, or distortion→Speaker or Headphone Volume Too Lowoutput is much quieter than expected→Left and Right Audio Reversedstereo channels appear swapped→Bluetooth Audio Keeps Cutting Outwireless audio drops or stutters→Speaker Detected but No Soundan output device is selected but remains silent→Speakers or Headphones Have No Soundthe selected output produces no audible sound→Only One Speaker or Headphone Side Worksleft or right audio channel is missing or much quieter→
Touchscreen
6 verified pathsSymptoms and diagnostic paths
Touchscreen Not Workingtouch input is not responding normally→Touchscreen Has a Dead Zoneone area of the screen does not respond to touch→Touchscreen Ghost Touchestouch events appear without intentional input→Multi-Touch Not Workingmultiple simultaneous touches are not recognized→Touchscreen Input Lagtouch response is noticeably delayed→Touchscreen Not Responding or Has Dead Areassome or all touches are ignored, delayed or register inconsistently→
Browser / permissions
7 verified pathsSymptoms and diagnostic paths
Browser Device Permission Is Blocking Hardwarethe browser cannot access a camera, microphone, location, notification, or other permission-gated feature→Screen Sharing Not Workinga browser or meeting app cannot start screen sharing→Screen Share Permission Blockedscreen capture is supported but access is blocked by permission or policy→Browser Location Not Workinga website cannot obtain your location→Browser Notifications Not Workinga website cannot show notifications even though alerts are expected→Browser Fullscreen Not Workinga browser page, video, presentation, or game cannot enter fullscreen→Phone Vibration Not Working in Browsera browser vibration request is unavailable or produces no felt vibration→
Network / connection
3 verified pathsSymptoms and diagnostic paths
Internet Says Connected but Websites Do Not Loadthe device appears online but web pages fail or stall→Wi-Fi Keeps Disconnectingthe network connection drops repeatedly or needs frequent reconnection→Internet Latency Is High or Unstablebrowser requests take much longer than expected or vary sharply between samples→
Browser storage
1 verified pathsSymptoms and diagnostic paths
MIDI
7 verified pathsSymptoms and diagnostic paths
MIDI Controller Not Detected in Browserthe Web MIDI device list is empty or access fails→MIDI Works in Browser but Not in DAWDeviceOK receives MIDI messages but a DAW or music app does not→One MIDI Key or Pad Is Not Workingmost notes arrive but one key or pad produces no note message→MIDI Velocity Is Stuck or Always the Samekeys or pads always send one velocity value or a very narrow range→MIDI Pad Double Triggeringone physical hit produces duplicate or rapid repeated MIDI note messages→MIDI Sustain Pedal Works Backwardssustain appears on when the pedal is released and off when pressed→MIDI Sustain Pedal Not Workingpressing the sustain pedal produces no MIDI control change→
USB / HID / Serial / Bluetooth
7 verified pathsSymptoms and diagnostic paths
WebHID Device Not Founda specialized HID device does not appear in the WebHID chooser→WebUSB Device Not Founda USB device does not appear in the WebUSB chooser→USB Device Not Recognizedthe operating system or app does not recognize a connected USB device→Serial Port Not Showing in Browsera USB/serial device is connected but no usable serial port appears→Serial Port Access Denied or Busythe browser cannot open a selected serial port→Bluetooth Device Not Showing or Pairinga Bluetooth device is missing from the expected chooser or OS list→Bluetooth Keeps Disconnectinga paired Bluetooth device repeatedly drops and reconnects→
Motion / sensors
2 verified pathsSymptoms and diagnostic paths
Printer
3 verified pathsSymptoms and diagnostic paths
Printer Has Lines, Streaks or Bandingprinted pages show repeated horizontal/vertical lines, gaps or streaks→Printer Colors Are Wrong or Missingcolors are missing, shifted, washed out or unexpectedly grayscale→Printer Print Quality Is Poortext, images or graphics print faded, smeared, jagged, streaked or otherwise degraded→