Hdmi connection

I just purchased a gateway desktop with a gateway monitor. It came with an hdmi cable, a dvi cable and a vga cable. The only way the monitor works is with the vga cable. If I use either of the other cables (as shown in the instructions) I get a "no signal" message on the monitor. Gateway has been no help with this. An thoughts?
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  1. did you restart the computer after changing the cables so it can refresh?
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