So I rooted my Lg G2 just fine, I've done jailbreaks and such in the past and consider myself tech savvy. However after trying to install a custom ROM on my phone, I got these white lines to where I couldn't see my screen. I found a fix for it and tried to conquer that myself as well. As I proceeded to flash a jdi kernel onto my G2 to get rid of the white lines and lack of display, I got an error and put myself into a boot problem. When I turn my phone on, I get a secure booting error everytime and my screen goes black. I have tried countless times to use the hard reset feature but I cannot get the it to come up with pressing with volume down and power buttons. I can't get into download mode either. My screen goes black within seconds and just sits there. SOMEONE PLEASE HELP IN ANY WAY POSSIBLE.