skimmer problems

[Calgarynewtankguy]

This is my first SW tank i just got everything up and running and fired up my skimmer (Red Sea c-skim 1200, that i bought used) and it is very noisy and wont produce bubbles at all. I have tried changing both the water flow and played with the air adjustments and nothing seems to work. I have never used one before but it sounds like a bad bearing to me but I know this are magnetic pumps so i am unsure.

any help would be appreciated.