iPad 2 shut off after screen remplacement

Hi,

I replaced the digitilizer from my ipad 2, and before gluing back together I tested it and it shuts off by itself.

If I do nothing It stays ON but when I put it on a solid surface like a table the small shock shuts it off. It reboots normally when I press the power button.

Everything else works well.

Is it possible that the fact that I dont glued the screen yet makes it shut OFF ?