My Monitor goes blank after switching to HDMI mode. I have three macs connected to my 2492 HDMI and its been working fine on all three until recently when the HDMI mode started going blank when I switch to HDMI.. I see the screen of the computer hooked to HDMI for a second, then it goes black, so it seems its getting info from the computer. The other computers, hooked to the digital and analog modes, appear fine. Any ideas?

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