|Have you tried unplugging the power cable? Unplug it, wait at least 15 minutes, then plug it back in.|
At what point exactly do you see the "Sleep mode" message?
It is possible some cables were loosened in the move? Have you opened the case and checked all the connections?
"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown