Total novice here-FYI. However I would appreciate advice or suggestions on the following problem. I was trying to hook up my desktop to my new HDTV. I started by successfully hooking up my laptop. That worked - so I know the tv and cable used works fine. I then hooked up my desktop and it initially worked. I tried running a program online but it said I needed an updated version of Firefox. So using the TV screen as my monitor I found and downloaded the appropriate upgrade and then I thought I should restart the computer. So I began that process and when the dialog box came up I selected RESTART and then I was called away from the room. Upon my return I noticed my tv was blank. The computer was on so I removed the tv cable and switched to the pc monitor and it was working. Switched back to tv cable and NO nothing! I am dumbfounded!! It did work and the cable/tv still works with laptop just not desktop. What did I miss??