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Ok. when you filled your loop, you left a lot of air inside it. Obviously this needs to come out. What you need to do is dismount your water block and radiator. Don't take the loop apart, leave it hooked up together.
Be sure that the pc is not plugged in. You can get a 12 volt power supply to run that pump, the sort of dc power supply that will plug into a wall outlet.
You are going to have to bleed the loop. Think of it like a baby that needs to be burped. ie. be gentle and patient.
What you want to do is have everything lower than the fillport on the pump and run it. You will have to move/wiggle/reposition some of the items perhaps to be sure of getting all bubbles out. This may take a while. With that much air in your loop, you will need to add a lot of water. So be prepared. Strongly suggest you have lots of towels handy in case of spills.
If while filling you get ANY water into your computer do not turn it on until you are 100 percent certain you have dried it out completely.
edit:
OP, have you solved your issue then?