How do I use external monitor if unit's screen fails?

Yeah, sort of. Except it will be via the mini display port. You might have to buy an adapter, depending on what ports your monitor has. But, once you get the screen connected you should show a picture. That picture will look like your desktop (unless you have a desktop that changes) and will either be with or without your desktop shortcuts. If it is with, there you have it. If it is without, press F7 and it should become with.