Comment 17 for bug 1313497

Question is maybe whether this is the usb keyboard or maybe some failure to start a local tty or framebuffer mode. If there is a login prompt, framebuffer and tty are most likely ok. If you can ssh into the server from somewhere close to it (to be able to press keys on the keybord at the same time) you could try to install input-utils. "sudo lsinput" should have an entry for the keyboard since it is detected. Then you could "sudo input-events <#>" where number is the number from the /dev line from lsinput.
Look I would have two input lines for my Logitech keyboard here, if that is the case try both. At least one of them should work...