Apple keyboard not working after installing new monitor

Yesterday I installed a new monitor - HP EliteDisplay E231i - to my Late 2013 Mac Pro. Previously I had been using super old apple monitors. My apple keyboard was working great - I had it plugged into the new monitor itself. I shut down the computer last night. This morning, the Mac Pro won't recognize my keyboard no matter what I do. I tried plugging it into every possible USB port on the tower and on the monitor. Restarted it after moving it each time. I'm currently typing with a Microsoft keyboard, which is working fine. I tried the keyboard in 2 other laptops (macbook pro) and it works fine. Is this a bug specific to the monitor?? I've been running Yosemite 10.10.2 since the last update, and I've had no issues till I switched the monitor out and tried to start the computer after shutdown.
Details: Mac Pro (Late 2013), Yosemite 10.10.2, 32 GB 1866 MHz DDR3 ECC, AMD FirePro D500 3072 MB
Anyone know what's going on?

Try resetting the SMC and NVRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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