Motherboard wont recognize keyboard until after boot-up

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Dec 6, 2011
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Issue: When I try to enter my BIOS on startup my keyboard is unresponsive. Once Windows is running the keyboard works fine. (It's a USB Corsair Vengeance K70). The thing that is strange to me is that the LEDs are on even when the keyboard is unresponsive during boot-up.

Things I've tried:
- Resetting CMOS by removing the battery for 15 minutes.
- Using a USB to PS/2 adapter with the keyboard. The lights are off and they keys are unresponsive even after startup.

Any help appreciated! Thanks.