So my Samsung tv has 3 HDMI ports, HDMI port 1 & 2 work perfectly well, but whenever I plug anything into HDMI port 3, it just says 'no signal'. I've tried connecting my sky box, DVD player & my iPad to the HDMI port 3 but it just keeps saying 'no signal'! Could it be that I may have deactivated HDMI port 3? Or do you think it's possibly gone faulty?
Any suggestions would be greatly appreciated, thanks.

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