What tools can you use to diagnose and fix USB connection errors?

Estos problemas ocurren comunmente en equipos "viejos", en los nuevos sería defecto de fábrica o bien el dispositivo conectado está da?ado. Si después de conectar uno o más dispositivos en el puerto y no se reconocen, abrir cmd con privilegios y teclear "set devmgr_show_nonpresent_devices=1" dar ENTER, posterior teclear devmgmt.msc y dar ENTER, esto para llamar el administrador de dispositivos. Al abrirse dicha ventana click en "Ver/View" y "Mostrar dispositivos ocultos/Show Hidden Devices", al seleccionar esta opción te mostrará también los dispositivos ocultos, posterior es cuestión de navegar en los distintos menus y borrar los registros de los puertos USB's que ya no estén presentes para dar cabida a la conexión de nuevos dispositivos.

Device Manager in Windows is a handy tool for managing your computer's hardware. If you're having trouble with USB connections, you can use Device Manager to inspect your USB devices. Look for any warning icons that signal an issue. You can try updating the drivers, disabling and then enabling the device, or uninstalling it and scanning for hardware changes to re-establish the connection. This utility helps determine if the problem is due to drivers or if the hardware is being detected by the system.

For advanced troubleshooting, the Command Prompt is a powerful tool. Use commands like `sfc /scannow` to scan and repair system files, or `chkdsk` to check for disk errors that might be impacting USB functionality. These commands can identify and fix deeper system issues that could be causing USB connection problems.

Sometimes, USB connection issues stem from power management settings that let the computer turn off devices to conserve energy. To address this, go to the Power Options in the Control Panel and adjust the settings. In the Device Manager, find the USB Root Hubs, and make sure the option allowing the computer to turn off the device to save power is unchecked. This can help prevent unexpected disconnections.

The BIOS/UEFI firmware settings on your computer can also affect USB connections. By accessing these settings during boot-up, you can see if any USB ports are disabled or if legacy USB support is turned off, which is sometimes required for older devices. Making adjustments in the BIOS/UEFI can often resolve connection issues that the operating system cannot fix.

If software solutions don't resolve the issue, hardware tools like a multimeter can help diagnose USB connection problems. By testing the voltage and current in the USB ports, you can verify if they are operating correctly. This approach requires technical know-how and adherence to safety precautions but provides a clear way to determine whether the issue is with the physical port or cable, rather than with the software or drivers.