I took my h100i off the board to attach it like the picture and now it's not working , doh.
I'm getting a libusb error pipe, libusb not found error.
Hashfast detect failed to initialize incorrect device.
The device keeps adding and disabling the device with those previous errors.
I'm using minepeon 2.4.6 with cgminer 4.3.4.
I had the same problem when I significantly re-routed the tubing. In my situation I clearly loosened the cooling head. Have you tried to the monitoring tool at a very low clock speed to make sure you have good contact? Reseating the cooling head, with the help of the tool fixed this for me.