I have an OLD Magnavox TV and I bought a GE universal remote 25008 so I can switch to 'aux' mode to watch DVD's. I can access the menu and scroll through the different options, but I can't get it off the 'antenna' setting. The up and down arrow keys don't seem to be working, even when I use the shift key - all it does is turn the volume up or down. Do you have any suggestions?