To test your speakers on Windows, you can use an online speaker test that plays stereo tones through your browser — you'll hear left and right channels separately to confirm both speakers work. Alternatively, use the built-in Windows test: right-click the speaker icon in the taskbar, select Sound settings, click your output device, and use the Test button to play a tone. If you hear nothing, check that the correct output device is selected (especially if you have HDMI, Bluetooth, or USB audio devices connected), the volume isn't muted or at zero, and the app you're testing in has its own volume turned up in the Windows Volume Mixer (Settings > System > Sound > Volume mixer).