You can decide to do a factory reset to your Toshiba television if you want to erase all the data you have on there, including your Wifi settings, and start anew. You do this by going to the Home screen, navigating to Settings, Device, and Software, and then restoring to factory default.
If your Toshiba TV Sound is not working. Try to reboot your TV and see if this solves the sound problem. Make sure your TV is not erroneously set to SAP which means Secondary Audio Profile. Now check the TV Audio Input and make sure the right input option is being used.
A reset of the remote control will often help to get it working again. Remove the batteries, press every button (one at a time), and operate the switches in every position. Each button should be held down for 2 seconds. Replace the batteries and start using the remote.