Unfortunately this is probably a hardware problem, hopefully you got it form Best Buy and it is under the 2 year warranty. The sad fact is Insignia TVs just don't last, however it might be something minor that a repair shop can fix. So I would take it into a repair shop and after they say it will take $400 dollars to fix it, chuck it and get a new TV.
The Flyback i'e the circuit board on the back of the tube as thus malfuctioned and give you this white line with sound.. If you did not have sound we would be discussing the PSU "power supply unit" This fly back for a 27 inch will run $105 plus tax.. The installation thereof would be done by a technition witch will charge 15 to 20 per hour.. Okay here is the sad part you can recycle this TV and get a flat panel for much cheaper then it would take to repair this unit "i am just telling you the truth" But do not shoot the messangero n this one, since I did tell you you're proble could you leave a rating? Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620
Go to settings manual, go to tuner mode, select CATV, than do an auto-programming or auto channel scan and you will be set. Make sure it is not set to AIR
You can just buy a new remote. Test it using the smartphone front camera trick. Or it is the television that has no signal, do a Power Reset. Pull the mains plug for 5 minutes. Press and hold the power button on the set for 1 minute. Plug back in. Also check the input leads on the back for whatever is supplying the signal, Cable, Satellite, OTA, then check the Source button on the remote.
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