Changelog

• 2026-09-23 Added the mouse, double-click and keyboard tests, a mouse and keyboard hub, and two fix guides.
• 2026-09-23 Added the sound test for speakers, and a guide for no sound on Windows 11.
• 2026-09-23 Rebuilt the headphone test, the home page and the tool list around the symptom you have.
• 2026-09-22 Site launched with the headphone test and two fix guides.