So, you are going to need to reboot the tv because the microprocessor is locked up. Here is what I would suggest:
-locate the POWER cord for the tv, and unplug it from the wall outlet (or back of tv).
-disconnect the suddenlink cable line from the TV tuner port on the back of the tv.
-press and hold the power button on the tv (not remote) for 20 seconds and release.
-plug in the tv power cord, the tv should come on, if not press power button. There won't be any signal but test the tv functions like volume, menu, channel.
-if the tv is responding, reconnect the suddenlink cable line to the back of the tv, signal should be restored.
Let me know how that goes and if we need to try something else or if the problem is resolved.