Broken Screen

Hi guys,
I accidently cracked the screen of my blackberry z10 and the touch was not working. So I bought screen replacement part from amazon which came with full front part including the screen, digitizer and everything else. Tried to replace the screen by myself, and now when I turn the phone on nothing shows up. I can see the screen turning on, but only displays black! Tried to put back my old broken screen but the exact same thing is happening, the screen shows only back! I can see it lightning up when it turns on, so it's not the same black as it is when the phone is off, but nothing is displayed!!! Does someone have a suggestion or solution for this?

Did you drop the phone when you broke the screen?

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