ATI Radeon 5570 HDMI not working

I have an ATI Radeon 5570 graphics card for my computer. I am using a ViewSonic HD monitor. When I try to use an HDMI cable (one end going into the card, the other my monitor), the screen stays black and says 'no signal'. I can't figure out what the issue is. Any suggestions?
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More about radeon 5570 hdmi working
  1. Is your monitor set to receive HDMI? If it was used with a different input last time, it may still be set to VGA or DVI.
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