Computer doesn't start anymore

I installed MineOS on my previous desktop and I set it up correctly. I then shut it down to move it to his final location, but now when I try to start the server, I cannot reach it neither with the web ui nor using monitor and keyboard. On a monitor it doesn’t even show the boot logo nor can I gain acces to it in any way. (Sorry for my english)

On the system that you built the MineOS on, does it have another drive attached?