Hello. This is probably really simple, but I'm trying to install either Windows Server 20XX (doesn't matter which version), or Ubuntu 16.04 on my PowerEdge 2950. I have enabled all USB ports in the BIOS. The flash drives I've tried show up under boot options under the Hard Drive option, but once I select it, it just hangs there forever. The OS installation drives are both legacy boot friendly, and boot from other computers just fine.
To troubleshoot, I created an Ubuntu DVD, installed the OS, and checked to see if any type of drive showed up when I plugged them in to the USB ports. I tried both of the bootable flash drives and an external SSD, but no additional file systems appeared.