Replaced screen, now it's not turning on. What did I do wrong?

"Reanna the hard reset that Jamie is telling you to do is a good idea to start out, and you should hold the buttons for more like 30 seconds, if nothing happens then I would take the back off the phone and make sure the battery is connected properly, if all is well with that, then I would plug it into a charger and see if that makes it power on, if that doesn't work open Itunes on your pc and plug the phone into it and see if its recognized, if it doesn't the next thing would be to put it in dfu mode while its plugged in and try for a restore, here is how, http://www.youtube.com/watch?v=bSQgy-ZHr..., that will keep you busy and hopefully one of them will work, keep me posted, good luck. If this answer was helpful please remember to mark it accepted.''

Update

Reanna you might have a tiny piece of glass behind the home button just for idea's, it's hard to see all of them without magnification, if you do teardown your phone I recommend removing the 2 sided adhesive on the mid-frame around the home button and around the earspeaker and front camera, by doing that you will remove all glass and debris."

You did nothing wrong instead you forgot to do something! Just hold down home and power together until you get to apple logo. If you get a white screen just hold down home and power again.

I read this: iPhone won't power on after repair. and decided to hook the phone up to my computer. It was in restore mode and would not come out. I clicked the Restore button in iTunes and it went through the process and the phone is now working fine!

I also have this problem the phone won't turn on and when plugged up to a charger it just vibrates intermittently I can't get it to do anything ! Any ideas ?

I dropped & cracked my phone went to amazon & got a iphone 4s replacement screen . Put it in and followed all directions charged the phone and its still black help peopleeeeeeee

i replaced my screen, turned it back on and it worked for a minute. after this it turned off by itself and it didn't turn back on, any recommendations on what to do >????