I had set up two kinect sensors with all usb connected and light on, so that's to make sure it is not the problem with connection. In the ipi recorder, it only detected one sensor, why is that? I want to have it detect two sensors otherwise the whole animation will not work properly.
Also in devices and printers as I had checked, if I put a random usb of those two, the first one always able to be detected, however, the second one randomly always have a "!" sign and double click of that device picture, under hardware, Kinect camera had the "!" again. How can I fix that? Below are the pictures.

