i just received this pump today and I'm already having problems. I noticed it was quite loud from the start. After reading reviews I was told it would be pretty much silent, but I can hear the motor from a distance. I thought the noise might have been due to the pressure or configuration in which i placed the block and rad, so I switched those around. Noise still continued. I thought it might have been the air bubbles, but I guess not. Noise still continued. Couple hours later, the pump wouldnt turn on consistantly, i have to give it a nudge to start. So I tried a different power supply, but the problem still exists. The pump seems to be getting worse by the minute. Now it barely turns on, and it seems that i have to shake a bit harder for it to start. Not too sure whats going on here.