Ensure the charging port and connector are clean and free of debris. Try a different power outlet or a different Surface charger if available. If the issue persists, a reset by holding down the power button for 30 seconds may help. If none of these work, it might be a hardware issue requiring professional assistance.

Try right-clicking the sound icon in your system tray, select ‘Playback devices’, and ensure your PC speakers are set as the default playback device. If they’re already set as default, try updating your audio drivers through the Device Manager, as removing the HDMI might have caused a configuration change.

To reduce the buzzing noise in your microphone, try using a noise suppression software or feature in your audio settings. Additionally, consider using a ferrite bead on the microphone cable, as it can help filter out electromagnetic interference that might be causing the buzzing.

The issue might be related to network settings or restrictions on your main and guest networks. Check your Verizon router’s settings for any specific restrictions or firewall configurations that could be blocking Xbox services. Also, ensure UPnP (Universal Plug and Play) is enabled or try setting up port forwarding for Xbox services. The fact that it works on the IoT network and hotspot indicates a specific setting on the other networks is likely causing the problem.

Check if your network adapter drivers are up to date since your PC was unused for a long time. Also, verify if other devices on the network are experiencing similar issues, which could indicate a broader network problem.