I just reorganized my rack and when I plugged my Dell PowerEdge R510 running 16.04 back in and turned it on, a number of very strange things happened. The first few times that I tried to boot, it got stuck on some unknown task. Usually it was after (succesfully waiting for the rf kill switch), but this varied slightly. I tried rebooting about five times. The fifth time I was presented with the login screen. I entered my password and after a delay of about a minute found this on the screen. I have desktop installed so I switched over to the GUI view. There I found the system is running in low graphics mode menu. I tried going through the troubleshooting menu, but my arrow keys didn't function and when I pressed enter to just select the first option, the cursor was moved to the option below it. The GUI then locked up entirely and I wasn't able to reach it at all on successive boots that gave me the same strange blue lines and red boxes. I have basically no idea what is going on or where to start. My fear is that some internal component (graphics card?) came loose when the server was being moved. Does anyone have any other ideas? For what it is worth I'm using UEFI boot. 
Low Graphics Mode and Bizarre Terminal Output
linux;ubuntu;graphics