I followed the Gary Honis Canon T4i astro mod video and did a HA mod. put everything back together and The camera does nothing when I turn it on, I dont know what areas in the camera could make this happen so I'm just gonna go through all the things that I think might have gone wrong. I'm fairly certain I have all ribbon cables put back in correctly but not 100% sure I guess, also the torque screws before taking out the camera sensor might not be tightened right, a few small plastic bits fell off around the sd card any bettery doors and one under the rubber to the top right of the screen, and also I'm not completely reassembling the entire camera when I turn it on as in I haven't been putting the plastic all together but all the electronics are connected the battery door and sd card door are shut. Any help would be greatly appreciated (There is also a small rattling inside the camera when I shake it)