Device Tests / Free troubleshooting tool
Screen Dead Pixel Tester
Use solid screen colors to check for stuck or dead pixels.
Screen Dead Pixel Tester
Use solid screen colors to check for stuck or dead pixels.
Choose a color. Full-screen testing may reveal stuck or dead pixels. Press Esc or click Exit to leave.
How to use this tool
Follow the steps above. Browser tests run locally when possible; other tasks provide practical troubleshooting guidance rather than claiming to scan your computer or network.
Important limitations
Results depend on your device, permissions, Windows version and network configuration. Back up important files before system changes and consult your device manufacturer for hardware repairs.