If your Kraken X53, X63, or X73 pump is not running and your CPU is overheating, first please verify if the cooler is visible in our CAM software. If the product is not visible in CAM, this is a separate issue with recognition, the display will only work fully if Windows and CAM recognize a cooler when the PC starts up. Please refer to this guide linked below for issues with recognition like these:
Now if your cooler is recognized in CAM, but is still overheating, this can mean the main power cable was inserted improperly into the cooler. While the main power cable is keyed to prevent it from being put in backward, sometimes customers are able to force it in. To make sure your cable is put in correctly, make sure the rightmost pin is empty on the main power cable. This is the side you'll have the cable facing when plugged into the cooler.
If your cooler's pump is still not working after verifying this cable is connected properly, please contact our customer service team.