Here are some steps you can take to try and fix your LG 27GN950-B Ultragear monitor that turned off after an overvoltage incident:

1. Check for Physical Damage:

• Look for any visible signs of damage to the monitor, its power cord, or the power outlet it was plugged into.

• If you find any damage, it's best to consult a professional repair service.

2. Reset the Monitor:

• Unplug the monitor from the power outlet.

• Wait for a few minutes.

• Plug it back in and try turning it on.

3. Check the Power Supply:

• If the monitor still doesn't turn on, it could be an issue with the internal power supply.

• You might need to contact LG support or a qualified technician to get it checked or replaced.

4. Test with a Different Power Outlet:

• Overvoltage can sometimes affect the power outlet itself.

• Try plugging the monitor into a different outlet to see if it works.

5. Contact LG Support:

• If none of the above steps work, it's best to contact LG support for further assistance. They can provide specific troubleshooting steps or recommend a repair service.

Important Note:

• Do not attempt to open the monitor yourself. This could void the warranty and potentially damage the device further.

• Be cautious when handling the monitor, especially if it's still plugged in.

• If you suspect a serious issue, it's advisable to consult a professional technician.

By following these steps, you can hopefully get your LG 27GN950-B monitor back up and running.