IMac mini DVI to HDMI problem?

Hi,
My iMac through mini DIV to HDMI doesn't detect a signal on my tv, I am running on a 24" early 2008 imac on lion 10.7.5. I've tried two different mini dvi to hdmi cables, two different tv's and different hdmi ports nothing seems to work. It detects my tv's and the screen flashes blue but has no signal each time, I am able to change the resolution etc of the tv's but it just stay black. I can set up a mini dvi to vga fine with my tv just not mini div to hdmi has anyone come across this issue?

yeah there is a setting called skip input it has the 3 ext and 3 hdmi, i tried skipping it but it to hdmi 3, which is the port tht it was connected too but it didnt work. Any more ideas?

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