I have the Aqua Xtreme 50Z mag drive pump. I got one, but it did not work (my stupidity, I guess) and I sent it back. I finally got my new one today, I hooked it up, and it dosent work. I RMA'd the first one, and upn talking to the owner of the place I got it, he said he hooked it up when he got it back and it worked. Now when I hooked up my new one, it dosent work! It says do not run it dry, and I never did, my loop is filled to the max. It is wired correctly, into the 12v rail. This is just going to be a run to flush out the system, so I'm not going to use any zerex. Why is it not working? Anyone have any suggestions? Also, I am just jumping the two pins on my ATX connector so I can use my PSU without hooking it into the motherboard. I doubt it, but could that be the reason? If you need any more info, just ask. Please, I NEED to get this working!