Why is my LG TV stuck on device reboot/factory restore screen?

I just replaced the main board on my LG 55G-U2. It was stuck on the LG Cube startup screen. Now it is asking me to either device reboot or reset/restore factory settings. The remote control is unresponsive even after putting in fresh batteries. I got it secondhand and cannot find the solution online. I am... show more I just replaced the main board on my LG 55G-U2. It was stuck on the LG Cube startup screen. Now it is asking me to either device reboot or reset/restore factory settings. The remote control is unresponsive even after putting in fresh batteries. I got it secondhand and cannot find the solution online. I am completely clueless now.
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