Electrical component problems may cause whining noises whereas lack of ventilation can cause the buzzing noises. Consider cleaning the fan and filter off any dust and ensure the air inlets are free. In some cases, you may need to uninstall and reinstall sound drivers or replace sound card.
Problems getting online – Network misconfigurations, software and hardware router errors, incorrect IP address, service provider latency and firewall application can all be responsible for this. Check all elements that matter, including your network connection status so you can reboot the router where necessary or call your ISP.