Error "Server exiting: Partition C.Program Files.Lotus.Domino.data is already in use"

Hello,

We have a small test server here that has been running fine until now. I rebooted the server and now I receive the following error;

“Server exiting: Partition C.Program Files.Lotus.Domino.data is already in use”

The server never starts. Would someone know what it thinks is in use? We don’t have a notes client installed on this machine, just the server.