Milind pointed out that all boxes on the medm screens were white. I didn't have diagnostics from the medm screens, so I started following the troubleshooting steps on the restart procedures page.
It seemed like maybe a frontend problem. I tried telnet-ing into several of the fe, and wasn't able to access c1psl. The section on c1psl mentions that if this machine crashes, the screens will go white and the crate needs to be turned off and on. Millind did this.
Now, most of the status lights are restored (screenshot).
Milind: I did a burtrestore following this and locked the PMC following the steps described in this elog.