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Ii would begin by changing the batteries in the remote. As they lose their power they will control some functions but not others. If that doesn't solve it, get back and we can take additional steps. i want to help.
Try the keys on the set I would think there is a menu key there on the set to help get you out of favorite channels. Universal remotes don't always work as thought should be and usually onthe the devices remote will access all functions. Is our remote dead or busted? Try opening it up look for bad solder on the circuit board clean the switch contacts on the the board it may just fix it
Call your store manager and if that doesn't get you action then call 1-800-WALMART and ask that the District Manager be advised and that you expect a call back. Wal-Mart should stand behind anything they sell including warranty. I purchased one for my new notebook and dealt with the store manager for information on the warranty before I bought it. The manager will respond.
The simpliest solution is always the best - I called the cable service provider; they reported an outage and quickly remedied the situation - but also tried to sell me their digital TV package. Thanks for your response.
Usually the blue screen is an indication that the video signal to the TV is not present. Most of the new TV's have a video input selection button on the TV and on the remote; try changing the video input selection.