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I',m Conrad and I'm here to help. Can you tell me the number of times the light flashes?
OK it sounds like a power supply problem. Do you know how to use a digital volt meter to take some power supply voltage readings?
The connectors on the power supply are labeled to show you the correct voltages. LG also had a problem with the harness going from the main board to the power supply board and sometimes just unplugging and re-plugging the harness at both ends with fix the problem temporarily. Try that first to see if it helps.,
Before you replace anything check with LG as there is a service bulletin concerning the defective wiring harness and they may cover it under warranty.
Try wiggling the connectors while trying to turn in on. If you still have nothing, I would suspect you are missing a power supply voltage.
http://www.lg.com/us/support/contact-customer-support OR (800)(###) ###-####/strong>
I would see if you can get the harness replaced first by LG as they can fail and cause problems
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