Strange issue

[LordChristoff]

Specs: 

Intel Core i7 4790k

MSI Gaming z97 Motherboard

16GB Dual Channel DDR3 Ram

Corsair H100i

 

Issue: 

I threw together this PC not long ago out of spares that I've had lying around the house. 

I decided to add the H100i since it's there to be used, initally I plugged the H100i cable into the wrong slot (like an idiot) which caused the PC to turn on and off. However once I'd figured out what had happend, I plugged it into the correct slot. This is when it burnt somthing, a bit of smoke appeared from the cable, which of course I instantly turned off the PC and tried to sus out what the issue was. 

Of course, I could not detect what was wrong and continued building it. However from here on, the USB's would not work at all. 

The Display works and I get to the 'Please insert bootable media' screen but none of the USB's at the front of the PC or back I/O want to work. 

Would I be correct in assuming that they've potentially fried? Which is still strange since I'm still getting a display output. 

And yes, I tried the keyboard/mouse on another PC to make sure they're still working... they are. 

Thanks in advance, 

- LC