you can take off the hose and try to move the end of the compressor wheel up and down, side to side. It should not feel absolutely locked, but if you can feel it move side to side (.010 in) that is not a good sign.
Long time ago I put a new 16g in a GVR4 and it screeched when i first installed it and would not build boost. I freaked out, but tried to put it under boost a couple times under boost. It broke loose and was quiet and spooled well for the rest of its life. I'm not saying this sort of good news would happen to you. Esp. if the car wasn't worked on recently. Could be an oiling issue.