What's wrong with my display?

Hey guys,

I've got an iPad mini here, and I'm not sure what's wrong with it. I had been trying to find the correct screw for the corner of my LCD for a while (a result of poor organization- learned my lesson!) and I finally found it, only to discover that when I powered on the iPad, no Apple logo displayed on the screen. I tried with a cracked LCD (on a working iPad it had turned on, just displayed weird colors), but still no dice. I plugged it into the wall outlet, but no response. I'm not sure what the problem is, anybody got an idea?