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I have a Vaio laptop with a Radeon HD 5650. It has HDMI out, while my SyncMaster 971p only has DVI in. I also have an HDMI to DVI cable.

When I connect the monitor with this cable to make an extended desktop, I am getting a 'Going to sleep' message on the monitor. Is there a way to make this combination work?

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Laptops typically disable the external display outputs to conserve power and/or reduce EMI emissions. You probably have to use a software command to enable the video output on that HDMI port. One of the Function keys will probably also perform this function. – sawdust Jan 19 '13 at 19:41

Enable the HDMI output in your operating system.

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