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Disconnect the Power cable and the Rca cable from the Tv and press and hold the power button of the Tv for Thrity seconds and release the button and then replug the cables back again and restart the Tv, it should work.
Is your tv connected to your cable box through HDMI, AV, or component? _____________________________
If its through HDMI then your cable carrier needs to load updated frimware in your box to communicate properly with your 2005 tv. The firmware loaded in your cable box needs to be "reverse compatible" for first generation HDMI from your 2005 tv. If your using AV or component hook-up and there's no sound then re-check all of your audio settings within the tv's menu. Also recheck the cable-wire your using and proper input/output ports.
ON your dvd player, is your tv connected through component, AV(rca) or HDMI?
If its through "component" then you need an extra audio cable to and from the DVD and tv.
Cable TV: Connect the LCD TV to the cable with CATV and Digital cable. Preset the cable TV channels into memory with Auto Scan function when using a cable TV system. Make sure you set the INPUT SOURCE properly (TV, VGA, S-Video, etc)