I just got Intel DH77EB motherboard and it works fine in all aspects, except second monitor connected to DVI output is not seen by the system. First monitor is connected via HDMI and work well. Previous mobos had no trouble outputting video to both monitors using same Core i5 2400 CPU.
I tried connecting different monitors using different DVI cables with the same result. The only reason I know DVI output on the mobo is not quite dead is because if I connect a monitor using VGA + DVI-VGA adapter, the monitor then shows the picture via DVI, but the picture is very dim as if monitor was not back-lit. Played with BIOS settings to no avail. Latest bios is flashed with no effect.