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Chances are that the power from the pole surged or cycled on and off, try unplugging it from the wall outlet for 5 min. Some of the newer TV's have a surge lockout protection feature that won't reset till all power is off for 5 min. But the key is unplugging it from the wall outlet, not unplugging it from the back of the TV. It took me a while to figure it out.
Check your TV's remote battries. If they are good, then, power off the TV at the main wall socket and unplug the power cord, leave it for 5 minutes. Now, connect back the main power cord, hold the Power On/Standby button on your TV and power then turn ON main switch on the wall. This should resolve your issue.
I work in an electronics store and I've come across this problem before. The only solution that has ever worked for the people who call in or come to see us is pretty simple. You need to unplug your PC from the TV (if you haven't already done so), turn the TV on by using the "channel +" button. Some TV's when turned off at the wall will not turn back on again unless you press the channel + button. Give it a go and see what happens. Let me know if you need more help.
Also, it sounds like your laptop may not have been supported due to the wrong resolution being outputted through your VGA connection. When you get your TV turned on again I'll see if I can help you get them to work together,
Good Day, OkieDi;
Try resetting the TV and/ or Boxes, to reset unplug devices from the A/C wall outlet, for 3 to 5 minutes then plug all back into wall again. Good Luck, big IRISH PS. or call a preist or an Authorized Service Center, GET estimate.
Check C81A2, C81A3, C81B3 and C81B4 (1000 uFD, 16V, 105C) on the DM PCB.
Check C8F19, C8F21, C8F22 and C8F27 (1000 uFD, 16V, 105C) on the FMT PCB.
If any are bad, replace all of them with part # 181P734030 (680 uFD, 16V, 105C).
For bobby11 and luis, it is the power supply. Part Number EAY34797001 in the 42" and EAY34796801 in the 32". This is a known problem, and somebody should start a Class Action against LG over this one. Part is available online and easy to swap out for anyone with the most basic knowledge.