My LG G2 doesn't tuurn on now that I changed the screen

I changed my LG G2 screen as it was broken. after I turned it on worked fine but touch didn't work... I figured out why and fixed it but its not turning on any more but when I plug it in the charger the red light starts flashing. It was asking me if I had forgotten the password as my friend entered in the wrong one a couple of times but that was when touch didn't work so I couldn't put in the email.
HELP PLEASE

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