What should I do if the TV displays 'No signal' or 'Invalid Format' when connected to a PC via HDMI?
Turn the TV off and on using the remote control, then reconnect the HDMI/DVI cable. If the issue persists, restart the PC with the TV already powered on. (Page 9)
From the official LG MT57S 24-Inch Full HD Smart TV manual, page 9
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