Re: Video audio issues
Start the laptop with the monitor connected and press the "Fn + F5" key , the monitor will flicker and turn on. on some models the key is "Fn + F8". on your "Function" keys (F1 , F2 , F3 ....) there will be a picture of a small box and a small computer on one of the buttons , that is the button you need to press with the "Fn" key , the Fn key is located on most laptops besides the ctrl, alt and spacebar key.
If pressing the combination don't work on the first try , do it again. You can do it whenever you want , even when the laptop is loading windows but preferably when the windows turns on fully.
Hope that helps.