Solved Loss of HDMI when TV is powered off
It has to do with what your PC does when it doesnt have a monitor connected to it.
It happend to me last year.

Essentially your PC will default to 800x600 when a monitor is disconnected. XBMC will shrink to fit that. When you plug your monitor back in the PC res will default back to 1920x1080 (or whatever) but XBMC will stay at that smaller res and sit up in the top left (atleast thats what mine did).

Make sure you have Full Screen enabled and the resolution set to 1920x1080 in the video output (

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RE: Loss of HDMI when TV is powered off - by Gazzyb - 2013-03-06, 03:59

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