Can I just hijack this and give credit where credit is due?
Having come back to iCue after about a year of ignoring it (PC is stuck under desk now) I noticed that my H115i Pro was not being recognised, whereas my K70 Lux, Vengeance Pro and Ligthing Node Pro (and even my RM750i) were. Tried eveything: software updates, cracked the case and chekced connections, different USB slots on Mobo. Nothing worked.
Then I found this thread and downloaded USBDeView. And guess what? It showed that the H115i was disabled. So I enabled it and bingo! Now recognised in iCue. Who knew?!! I've no diea why it had been disabled.
So thanks DevBiker, great tip there.