9c error (no usb ports used)

I tried booting up my pc and I keep getting 9c errors, even though I unplugged and replugged all the wiring in my motherboard (MSI z97 Gaming 5). Even after removing all the usb connectors to my motherboard I keep getting 9c errors, there are no usb ports connected! Resetting cmos did nothing to help the problem.
My specs:
i7 4790k
No Gpu
1 x 4 gb Adata ram
1 x 4 gb kingston ram
Please help thanks!

Quote
1 x 4 gb Adata ram
1 x 4 gb kingston ram
  Don't mix RAM. Try with single stick only.
Though 9C is USB error.

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