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Hdmi haswell hd4600 no signal after changing lg tv source


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I m running Mavericks on ASUS Z87i-PRO Haswell i5-4570T
All fine
HD4600 intel recognized with 1024Mb shared memory
Really fine and nice 1920x1080 resolution on my LG 3d HDTV connected both HDMI or DVI

BUT: when i switched MY LG TV source from HDMI3 (where i connected my PC) to HDMI2 or HDMI1 or every other source or shut down my TV, and immediately soon i returned to HDMI3, LG TV display has NO SIGNAL.

NO WAY disconnecting and reconnecting Cables.
It seems Mavericks doesn't recognize at all video output.
I've to do an hard reset. No other chance.


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