Why did my external HD monitor go blank after working fine while hooked up to a new MacBook Pro?

Why did my external HD monitor go blank after working fine while hooked up to a new MacBook Pro? I have the Moshi adapter and HDMI hooked up to the 27 inch monitor. It was working fine and when I came back after lunch the monitor was blank but the MacBook Pro screen was fine. Could it be the adapter?

could be, try powering down the mac, with the exmonitor connected and see if it is recognized

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