Alphacool 755 Pump stoped working

Okay here's the thing when I install the pump and I was running the loop to feel it it was working just fine, and then I left it on for the leak tes.
After that I reconnect the motherboard and everything and bot the system , after maybe 30 minutes to pump stopped working
Note. I didn't conect the 4 pin pwm
Help please

Check your connection (molex) to the psu. Maybe swap to another molex on the psu's connection and connect your PWM to the motherboard's CPU fan header. Boot up and go into the bios. Check under the fan header's PWM reading in the bios.

Bad pump is bad..... http://www.overclockers.com/forums/showthread.php/780946-Watercooling-Drama!

There seems to be an issue with these pumps that Alphacool is allegedly covering up/not admitting to.

Soulcatcher668 said:

Bad pump is bad..... http://www.overclockers.com/forums/showthread.php/780946-Watercooling-Drama!

There seems to be an issue with these pumps that Alphacool is allegedly covering up/not admitting to.

Click to expand...

It affects the 655's too.
Already had 2 RMA's in.