I have a mainboard DH87RL and made the mistake to choose in the BIOS video settings 'Primary Adapter = Always Internal' and 'Primary Port = HDMI'. Since then I don't get any video at all, neither with and without PCIe video card. Nothing on HDMI and nothing on DVI. I tried to remove the battery or the BIOS security jumper to reset the BIOS settings, but without success. How do I revert this change when I cannot see the BIOS menu?
At this point, if you have tried all the steps mentioned by other users and issue persists, I would say there is an internal problem with the unit and may be necessary to replace it.
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