https://www.gamespot.com/articles/oculus-rift-headsets-have-stopped-working-and-ther/1100-6457235/

Oculus Rift headsets have stopped working as part of a huge, widespread technical snafu that the company is currently trying to fix. Rift users have been unable to boot up their headsets today due to an expired security certificate. The headsets are rendered basically useless now.

"This is an issue with our software certification that we're still actively working on," Oculus said on its website. "For security, we use a certificate to ensure that the software you receive actually comes from Oculus. That certificate has expired, and we're looking at a few different ways to resolve the issue."