Background displaying and no channels

Hi, my box has just froze for some reason so I restarted it zgemma h5.2s and when it rebooted i got to the wooshbuild background, went to the channel listing. Selected a channel but instead of changing to view the channel it went on the channel but there's no audio or video just the wooshman background has anyone experienced this and knows how to fix it? iv test to see if box is connected to internet and it is Thanks.
 
check your hdmi lead, also are you trying a free channel such as bbc 1 or a premium channel?
 
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