Allow me to address this problem which does efficial&client=firefox-a&channel=fflb&gfe_rd=ctrl&ei=2vsiU825H4y2rAfXiYCIDw&gws_rd=cr" target="_blank">not really coincidence with other issues related to that card, generally linked to as I do not have a double DVI setup. Please help out.
Problem: Samsung LED TV suddenly goes black ("no HDMI source detected") with Windows starting up, LED TV not recognised in Control Panel or Device Manager
> HDMI port works as the boot screen is replicated on both screens --> no GPU hardware issue
> with only HDMI cable plugged into the Radeon 6800, the TV screen goes black just as well --> no 2x DVI issue
> motherboard onboard HDMI works fine, Samsung LED TV recognised with Generic PnP driver --> no issue with HDMI cable or the Samsung LED TV
There's something wrong with the GPU setup, perhaps in the boot menu (Already activated multiple screens on the Sandybridge Northbridge there), perhaps with the drivers (although no issue with PnP driver when LED TV connected onboard), perhaps and most likely with the graphic card software.
How to get that HDMI port working?
> ASUS HD Radeon 6850 (2 DVI, 1 HDMI, 1 DisplayPort)
> no overclocking
AMD Catalyst Driver Version, and Driver History
> AMD Catalyst software and drivers (version 13.12), fresh Windows 7 Ultimate setup (no driver history)
> Windows 7 64-bit; Service Pack 1
Motherboard or System Make & Model
> i5 2310, ASRock H67M motherboard (USB 3.0 & SATA III)
Display Device(s) and Connection(s) Used
> Samsung SyncMaster by DVI (only 1 DVI occupied)
> Samsung LED TV S5500 by HDMI