Which Mod Screwed Up My Main Login Page?
 

As you can still log in at the top of the screen goto your admincp and then disable the plugins one at a time until the issue is no longer there.

If you can not log into your admincp then disable the entire plugin system by having the following in your config.php in your includes folder

define('DISABLE_HOOKS', true); (if you have // before it in your config.php then just remove the //)

I've got it on line #2 of my config.php

I found the mod and template edits that screwed up my main login page. https://vborg.vbsupport.ru/showthread.php?t=230415