Well it could definitely be that the pump is broken, especially if you used to hear water flowing and now you don't. Best bet is to send an email to the manufacturer and try to get an RMA, unless you have a store warranty. Then just go through them and maybe use stock cooling in the meantime.
3 year warranty thank god, so far I'm not liking Ibuypower's customer support, 2 days, no reply. Could it be maybe a small air bubble in the water because I listened very closely and it almost sounds like gurgling, I'm not going to bet anything on that assumption though.