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Depending on the computer type and model, and OS, somewhere in power-saving settings, you need to turn off the sleep option. If there's no signal from the graphics card, the monitor will go to sleep.
Unfortunately, this is a standard problem, as when your laptop goes into sleep mode, it shuts off power to the secondary monitor, without giving it the signal to go into sleep mode. You could try digging around your settings, but most likely you'll just need to turn off the monitor when you're not using it.
If you set the PC to go to sleep after certian amount of time than it will not put out signal to the monitor. You need to go to display properties (right click on the desk top)/screen saver -power/set the display to never turn off.
Go to main menu, turn off sleep mode, then find the "autoprogram" feature and select it. THis will program all available channels, just make sure you tv is set to AIR for regular tv and CATV if you have cable.
The thunderstorm may have reset the television. Hopefully there is no damage done to the tuner
Does the monitor go to sleep when you unplug the video cable? If so, then the computer is still sending a signal, if not, check the monitor menu settings for no signal settings.
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