HTC One M7 :: Black Screen And Repetitive Vibration (won't Turn On)

I bought a HTC M7 (Verizon unlocked) with a broken screen. (stock rom, not modified at all, and with android lollipop). After I replaced the screen, I turned it on and it worked just fine. But after using it for a while I noticed that the notification bar wouldn't come down, so I assumed maybe it was a connection that was giving me that problem and disassembled it again. I checked everything again, made sure everything was in place and reassembly it again.

When I tried to turn it back on, I just got a vibration... and a Black screen. Tried to turn it on again, but again just a vibration and a black screen (not sound at all). I plugged it in my computer and the computer makes the sound that something is plugged in, but the phone does not appear connected (recognized). Also, the charging red light, won't come on. (not even with the charger or connected to my computer)

I've tried:
1) Hold power button + vol/down = just vibration
2) Hold power button + vol/up = just vibration
3) Hold power button + vol/up+down (for about 2 minutes) = just vibrates over and over during that time
4) Previous steps under a bright light. Literally I stepped on a table and did it under a light bulb, and nothing.

I'm quite desperate and sad because it was working great (except for the notification bar), and now it won't turn on... just freaking vibrate..

I left the phone charging during the night and the green light came up in the morning. I tried to turn it On while connected, but the green light disappeared and it vibrated again once...