Having problems with your Flat Panel Televisions ?

Hi, I have a 27 inch Dynex LCD TV model: DX-L26-10A manufactured (June 09) I've been using it for tv as well as an external display for my mac with an HDMI cord. The tv was working fine yesterday, then when i came to turn it back on there was sound from the TV, but no visual but my direct tv's 'please wait' then black. nothing and a high pitched frequency sound everytime i turn the tv on. Does anyone know what the problem could be? I've tried unhooking/rehooking the cords. still i get that so

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Hi, I have a 27 inch Dynex LCD TV model: DX-L26-10A manufactured (June 09) I've been using it for tv as well as an external display for my mac with an HDMI cord. The tv was working fine yesterday, then when i came to turn it back on there was sound from the TV, but no visual but my direct tv's 'please wait' then black. nothing and a high pitched frequency sound everytime i turn the tv on. Does anyone know what the problem could be? I've tried unhooking/rehooking the cords. still i get that so

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